Sinn U1 on Bracelet

Automatic winding mechanical diver's watch
• Case diameter (mm): 44.0
• Case thickness (mm): 14.3
• Case lug width (mm): 22
• Weight - head only (grams): 113
• Case back: Solid
• Case finish: Matte
• Case metal: Submarine steel
• Dial color: Black
• Front crystal: Sapphire
• Tegimented: Bezel only
• Movement: Automatic mechanical
• Manufacturer's limited warranty: 2 years
• Warranty service: RGM or Sinn
° Earn 4180 WatchPoint Rewards on this purchase
WatchBuys Direct Price: $2,090.00
Availability: In Stock - Ships Immediately

Sinn U1 on Bracelet
Sinn U1 on Bracelet
Product Details

The technology and design elements used to create the Sinn U1 go far beyond standards used at most watch companies.

The U1 case is made from the same steel that is also used in the construction of the outer hull of submarines. The steel was procured by Sinn from a steel supplier to Emden GmbH, one of Germanys North Sea shipbuilding yards who construct submarines from the very same steel. This special steel is also amagnetic which means that is does not have magnetic properties and cannot itself become magnetized. The watch movement itself is protected from magnetic fields up to 4,800 A/m.

Because of the special steel used from the submarine steel manufacturer, the case resists the effects of exposure to salt water and salt water environments.

The uni-directional ratchet operated rotating bezel is also milled from this submarine steel and is Tegimented. The indices are machined directly into the bezel without the use of bezel inserts, which can corrode or come loose at deep depths. The international testing lab of Germanischen Lloyd has tested the U1, and determined that the watch can be certified as water resistant to 1,000 meters. This same firm tests submarines for their ability to withstand the effects of underwater use.

Matte black dial with date at 3, Super Luminova on hands and markers, and striking red seconds hand complete the design. Other features include sapphire crystal with anti-reflective coating, and stainless steel bracelet.

When you purchase your new Sinn watch from WatchBuys, you'll not only get a finely engineered timepiece with excellent value for money, you'll also benefit from the WatchBuys Sinn Advantage.

WatchBuys Advantage #1

Because we are the official and authorized North American Sinn distributor, your name and watch serial number will be automatically registered in our database for a Sinn manufacturer's limited warranty which we pass through.

This means that should your watch require service during the Sinn manufacturer's limited warranty period, service will be provided by Sinn in Germany when you return your watch to them. This Sinn manufacturer's limited warranty is transferable to subsequent owners as allowed by Sinn.

You are responsible for paying the shipping charges to Sinn, and all repairs that Sinn approves under its warranty are at no charge. Sinn will also pay the return shipping charges to the address you specify.

The Sinn manufacturer's limited warranty period is as follows:
  • Watches in the EZM Series: 3 years
  • Watches marked AR containing inert gas: 3 years
  • Watches in the DIAPAL Series: 5 years
  • All other Sinn models: 2 years

WatchBuys Advantage #2

As an added benefit to those who purchase Sinn watches from WatchBuys, you may choose to have your warranty repairs serviced through our US service center, RGM Watch Service located in Mount Joy, Pennsylvania. This added service saves our clients the time and effort of returning their watches to Germany for repair. This benefit is transferable to subsequent owners who purchase directly from the original registered owner.

Please note that you are responsible for paying shipping and insurance charges for sending your watch to RGM. Once they reach your watch in the service queue they will determine which repairs are covered under Sinn's warranty.

It is important to note that oil-filled quartz Sinn watches must be repaired in Germany (EZM 2, Hydro and UX series). If your watch meets one of these conditions and requires service under warranty, please contact us and we'll provide instructions for shipping the watch to Sinn in Germany.

WatchBuys Advantage #3

Your watch will be repaired at no cost to you other than shipping charges to either Sinn or RGM during the warranty period. Sinn watches purchased through the "grey market" (non-authorized sources) may carry no warranty from Sinn. Sinn watches purchased through authorized overseas retailers are governed by the warranty policies of those dealers and/or Sinn, and typically must be sent to either the overseas dealer or Germany for repair.

WatchBuys Advantage #4

You'll be wearing your new Sinn watch soon after your order is placed since we stock Sinn watches and ship free using FedEx Air. Plus, since we are located in the United States, there are no "hidden charges" for shipments to US residents as is the case with most overseas dealers. Such charges can add up to 15% to the cost of your new watch, and include credit card surcharges, foreign exchange credit card bank fees, import duties and taxes, and custom's broker charges.

WatchBuys Advantage #5

WatchBuys offers a comprehensive return policy with no restocking fees to US residents. Overseas dealers, including those involved in the grey market, typically don't offer a return policy, and if they do, returning a watch under the policy is both complicated and expensive due to import/export and custom's requirements. Restocking fees are also common and may range up to 15%.

Learn more about our return policies.

WatchBuys Advantage #6

WatchBuys is pleased to accept payments through PayPal, debit and credit cards. We charge no surcharges to use credit or debit cards, and because we are based in the United States your US card is charged in US dollars with no conversion or exchange rate fees.

We also accept payments from PayPal and charge no surcharges.

Please note that to pay by credit card, debit card or PayPal your account and/or card must be issued by US or Canadian financial institution and billed to a confirmed US or Canadian address.

WatchBuys Advantage #7

When you purchase your new Sinn watch from WatchBuys, you'll earn WatchPoint Rewards which accumulate and may be redeemed against future purchases.

Watch Reviews

Sinn U1

"Sinn U1"


Comments about this watch: Watch looks and wears great.

Watchbuys customer service is better than Apple! Responsive, helpful and attentive.

Sinn U1

"Sinn U1"

Chris H

Comments about this watch: Absolutely fantastic watch.

Customer service from watchbuys was terrific. A lot is made of the size and the heft of this watch. I have 7 3/4" wrists and muscular forearms, and the watch looks perfectly proportional to my arm, however if you have thinner wrists, and forearms this watch may be a little big. Great Lume, this thing is built like a tank, and gets noticed much more than my Rolex Deepsea.

Sinn U1 and Sinn EZM 7

"Sinn U1 and Sinn EZM 7"

Barron S

Comments about this watch: First and foremost, I am a collector of watches. Even though I am a modest high school English teacher with an even more modest budget, I have always admired and appreciated a well made watch. Prior to discovering Sinn, I purchased and owned a Rolex GMT Master II, Omega Seamaster, Omega Speedmaster and of course Seiko's Orange Monster. Last year, through chance, I happened upon the Sinn watch brand and became instantly hooked on their style, function and overall aesthetic functionality. I purchased a Sinn EZM 7 firefighter watch last year. Immediately, I realized that I had found a company that I would never leave. After wearing the EZM 7 for over a year (the watch never loses time, has not shown wear/scratches anywhere despite its constant usage and its hands down awesomness in regards to look, style and overall functionality). So for the new review. Last month I took the plunge and ordered my second Sinn watch, the Sinn U1. Along with ordering the watch I also ordered a black / r... - more details

Excellent Customer Service and Watch

"Excellent Customer Service and Watch"

Travis L

Comments about this watch: This was my first experience dealing with Watch Buys and it was nothing short of fantastic!

Very knowledgeable and eager to answer my questions making sure I was getting what I expected. Super fast shipping and packaging was A+.

The watch itself is everything I was looking for and I was not disappointed in any way. The accuracy is way better than I was expecting and the fit and finish of the piece is amazing.

Thank you Watch Buys for taking care of me.

Sinn U1

"Sinn U1"

Ted H

Comments about this watch: The watch is a Sinn U1 on bracelet. I've had it three weeks now and it is running consistently +7 sec per day which should be easy to regulate down to better than +3 if past experience with this movement is any guide.

I really like the watch. It is about the biggest watch I would wear and feels quite heavy compared to the dress/sport watches I've worn in the past, but you get used to it in a day or two. You don't get the precise "click" when rotating the bezel that you get on some other dive watches but it's not loose and it stays put after it's moved. Again, it just takes some getting used to.

The watch is tough - I've already managed to bang it around a bit and it is obviously not going to ding easily.

I highly recommend the Sinn U1 and Watchbuys.

Sinn U1 on bracelet

"Sinn U1 on bracelet"

Kenneth S

Comments about this watch: I couldn't be happier with the design & build quality of this tank of a watch, or with the service I received from WatchBuys.

Just an outstanding experience all around, and I look forward to shopping here again soon!

Quality beast

"Quality beast"

Craig H

Comments about this watch: Customer service: Excellent customer service. Watch arrived in a very timely manner. Well packaged.

Watch: Flawless craftsmanship. Nicely proportioned. This is a thicker watch compared to prior watches I have owned, but not obscenely so. Still fits nicely under sleeve. Smooth bezel with secure clicks. Position of crown is nice as it doesn't dig into dorsum of hand. Comes with tools for adjusting band.

Band is very comfortable and barely notice I'm wearing it throughout the day. The watch is heavy as you would expect. Illumination is subtle, but sufficient. The sapphire, body and band have held up to a beating. Have wacked the face against pipe and brick without any scratches. Has kept perfect time for 3 weeks so far.

This could be the last watch I own, but I've already started looking at other Sinn watches. I would highly recommend this watch without reservation.

Outstanding Watch!

"Outstanding Watch!"

Charles F

Comments about this watch: This U1 makes my Rolex Sub feel cheap and flimsy. 

It's heavy, yet wears very comfortably. The dial is the most legible and unique of any watch I have owned, and I have owned plenty. It's running +3 seconds a day right out of the box, that's Chronometer standard. 

WatchBuys even sent it with the time/date set for my home, when I opened it up, all I had to do was put it on! 

Great Watch, great dealer!

Canadian customer

"Canadian customer"

Matthew P.

Comments about this watch: A close friend has worn this watch daily for almost 5 years. Somehow its understated appearance actually improves with time and the build quality is such that it still looks brand new.

I finally took the plunge, and have no regrets. This is a fantastic piece of engineering, both on the bracelet and the silicone strap.

And, BTW, if you are buying from Canada, duty is only 5%, and watch arrived within days. Excellent buying experience.

Beautiful rugged watch that is meant to be used.

First and last watch for a long while

"First and last watch for a long while"

Thomas D.

Comments about this watch: The watch itself is simple yet beautiful.

I haven't tracked it yet but it's been keeping very accurate time. It also feels very sturdy I have no fear about knocking the watch around everyday.

 If you want a timepiece that you can wear everyday and not think about I wouldn't recommend anything else.

Bill in VA

"Bill in VA"


Comments about this watch: Wanted a U1 for several years, very happy!

Great service, great watch

"Great service, great watch"

Danny R

Comments about this watch: I've only had the watch a couple of weeks, but had been eying a U1 for a few years before finally taking the plunge - although that's probably the only plunge I will take with the watch as I have some sort of irrational fear of diving...

Anyway, the watch was delivered just as described and I am very pleased with it. I was a bit apprehensive about its size being too large for my relatively smaller wrists but it feels and looks smaller on my wrist than I was imagining. The bracelet is great and seems to be very high quality and very sturdy for its price, but I promptly switched it out for a canvas NATO strap. Although I imagine I'll go back and forth between the bracelet and the NATO straps quite frequently.

Almost perfect

"Almost perfect"


Comments about this watch: Great watch. Very tough case.

I had 1 problem in Death Valley (USA) it got so hot about 115F that dust from the dial got stuck to the luminescent on the minute hand and has been there since.

I would buy one again though, it's a very enjoyable watch.

The Sinn U1 seems Indestructable

"The Sinn U1 seems Indestructable"

James B.

Comments about this watch: I would be reluctant to take one of those finely polished highly advertised Swiss products to get banged up among tanks and regulators and such during Scuba, but not so this watch since it really seems bulletproof. It is a heavy watch, and not at all delicate, but for my needs and sensibilities, it seems almost perfect.

I have not owned it long enough to fully test its timekeeping abilities, but if a few seconds each day really mattered, I would not be wearing an automatic watch. I am primarily concerned with deep water resistance and the ability to stay intact during rough use and this watch fills the bill.

I am quite pleased with it.

Great watch! - as advertised

"Great watch! - as advertised"

Taylor B

Comments about this watch: The U1's simple appearance wears well with jeans or business casual and is a great diver for its intended purpose.

Though big and robust, it doesn't feel heavy on the wrist. The submarine steel looks better in person than on print.

Excellent watch

"Excellent watch"

Peter W

Comments about this watch: Received my U1 today. It is better in person than it shows on the site.

The quality is readily evident; in fact, each of the Sinn watches I have ordered from WatchBuys are of the highest quality.

In addition, the customer service at WatchBuys for each order has been stellar.

Sinn U1

"Sinn U1"

Luigi A.

Comments about this watch: This has to be one my favorite watches to wear on a daily basis.

Built like a tank and shows no signs of wear.  I also just ordered a Sinn U212 SDR!!! Cant wait!!!

Sinn U1 w/ braclet

"Sinn U1 w/ braclet"


Comments about this watch: The photos of this watch don't do it justice. I love the simple uncluttered dial, very easy to read, and functional as a dive watch and a non-flashy dress watch.

Ordered it yesterday and received it today. Great watch and great service. Thanks

Great piece!

"Great piece!"

Don W.

Comments about this watch: Fantastic looking watch with a great build.

It's also very accurate, all I can say is buy one!!

Sinn U1: Well worth the money!

"Sinn U1: Well worth the money!"


Comments about this watch: This is a very distinct and well built piece.

I've had it for a couple of weeks now and it hasn't left my wrist. I love how resizing the bracelet is a piece of cake. This watch is a definite keeper and I know it will last a lifetime.

Splendid work Sinn!

Sinn U1

"Sinn U1"


Comments about this watch: For me, the U1 was love at first sight. I had heard and read great things about the watch and decided to treat myself to one.

I really like the watch and the great customer service at WatchBuys!

X-mas Gift

"X-mas Gift"


Comments about this watch: I had been looking at this watch for quite some time and finally made the decision to purchase. Actually it was a X-mas gift from my wife.

Anyway, definitely everything that I had researched was true and I couldn't be happier. I'm very glad that I purchased it on the bracelet because I find it much more comfortable than the rubber strap. It's only about 2 weeks old but so far so good and no complaints.

Loving my new Sinn U1

"Loving my new Sinn U1"


Comments about this watch: Everything about this watch is better than expected.

Adjusting the bracelet is a "Piece of Cake"as well as changing to the strap(thanks to the drilled lugs). The manual is as informative as it is well written and the supplied tools are more than adequate.

I'm looking forward to many years with this watch.

Great watch

"Great watch"


Comments about this watch: This watch is built to last and has a distinct design!

It's now my favorite watch to wear casually and formally.

Great watch

Sinn U1 Masterpiece

"Sinn U1 Masterpiece"

Steven C.

Comments about this watch: Along with owning my newly acquired Sinn U1, other automatic watches in my simple collection include an Omega 300M SeaMaster Automatic, Baume and Mercer EX Executive Dual Time, Seiko "Orange Monster", and a LUM-TECH B2 Combat

I get more compliments on the Sinn than any other, accurate as a certified chrono, and seemingly indestructible. Build and quality equal or exceeds time pieces costing 4 times the U1 cost.

Favorite daily watch.

Great Buy

"Great Buy"

Andrea G.

Comments about this watch: Awesome piece of engineering. A diver's watch distinguished from the rest of the pack.

Beautifully handcrafted, solid, unique design, great feel and look.

Great Watch

"Great Watch"


Comments about this watch: A must owned time piece..captured by its solid build n unique markers.

Beautiful and Functional

"Beautiful and Functional"


My comments on Sinn U1

"My comments on Sinn U1"

Julianne A

Comments about this watch:

Purchased as retirement gift for my husband and it's worth every penny.
This timepiece is built like a tank as he states and he likes this watch and wears it more than his Rolex Seadweller and for a watch this size he states its very easy to wear on his wrist.
Don't hesitate and don't wait and miss out on this timepiece & for WatchBuys they're the BEST !!!

Sinn U1

"Sinn U1"

Tim A.

Comments about this watch: Well worth the wait. This timepiece is built like a tank and takes all the abuse you can give it. Runs as accurate or better that any of my Omegas or Breitlings.

Best bang for your buck in luxury timepieces. This is a watch you depend on to look great with an Armani suit or a Body Glove wetsuit!

Sinn watches feature a number of cutting edge technologies, many of which are unique to Sinn. Please note that not all Sinn watches, including the watch on this page, use all of these Sinn technologies.

Among the more notable Sinn technologies are:

Tegimented Hardened Cases

Many Sinn watches are fitted with Tegimented cases produced in-house by Sinn's case making affiliated company in Glashutte, Germany.

Standard steel used by most watch companies has a hardness of between 200 and 240 HV (Hardness Vickers is a common scale used to measure material hardness). The Tegiment process produces a hardness of at least 1,200 Vickers which is five times harder than standard steel (and on some Sinn models up to nine times harder than standard steel).

The Tegiment process is not a coating consisting of a foreign material; instead the steel itself that has been hardened using a special engineering process that creates a hardened barrier. The base material is a type of stainless steel also used for surgical implants, and the stainless steel resistance to corrosion is further improved by the Tegiment hardening process.

The primary advantages to a Tegimented case are extreme resistance to scratches and other case abrasions, as well as increased resistance to corrosion.

Please note that certain Sinn watches are fully Tegimented (case, bezel) while others are Tegimented only on the bezel. Use the links below to view both categories.

  • View Sinn watches with fully Tegimented cases.

  • View Sinn watches with Tegimented bezels only.

Dehumidification Technology

A number of Sinn models feature cases filled with inert gas. Sinn has found that filling the case with inert gas can help prevent the introduction of moisture and humidity to the case, as well as provide a more stable environment for the oils that lubricate the movement.

The proper care of any mechanical watch movement mandates that these oils maintain both their viscosity and lubrication properties.

  • View Sinn watches with dehumidification technology.

Copper Sulphate Capsules

A number Sinn models use one or more copper sulphate capsules to absorb humidity trapped inside the case. Over time these capsules will gradually turn dark blue indicating that humidity has been absorbed.

The primary benefit to these copper sulphate capsules is a more dry and stable environment for both the movement and the lubricating oils. Together with Sinn's inert gas treatment these capsules form the basis of Sinn's Dry Hold Technology.

This technology not only provides a more stable environment for the movement, but also prevents fogging of the crystal when going from hot to cold environments or from humid to non-humid conditions (such air conditioned buildings).

  • View Sinn watches with copper sulphate capsules.

Extreme Antimagnetic Protection

Magnetism can cause dramatic swings in the timekeeping of a mechanical watch movement. People are often exposed to magnetic fields without even being aware - frequent high altitude flying, metal detectors, audio and video equipment, medical equipment and computer equipment can all cause problems with magnetism.

Many Sinn watches offer extreme protection against magnetism up to 80,000 A/m. Sinn achieves these results using a number of different technologies, including special case and case back construction, soft iron components in the case and protective rings surrounding the movement.

  • View Sinn watches with extreme antimagnetic protection.

DIAPAL Oil Free Escapement

Sinn caused quite a stir when they first released their DIAPAL technology. Beginning in 1995, Sinn began work to create an oil free escapement. With any mechanical watch movement, the aging of oil, especially in the escapement can create long term problems for that movement. Additionally, as movement oil ages, required service intervals become more frequent.

Sinn's early analysis to this problem provided a quick solution (at least in theory) - if you don't use oil, it can't age. The process began by exchanging the ruby escapements for diamonds (the word "DIAPAL" derives from the German name for diamond escapements) in order to achieve the desired effect. The designation stuck, even though today Sinn works with solutions taken from advanced nanotechnology rather than diamonds.

The result is a movement that proves so reliable that Sinn offers an unprecedented five year warranty on their DIAPAL watches.

  • View Sinn watches featuring the DIAPAL oil free escapement.

Hydro Oil Filled Technology

Sinn has developed a technology termed "Hydro" in which the entire watch case is filled with oil. Watches using this technology are based on quartz rather than mechanical movements.

By using this type of movement, Sinn is able to fill the watch with oil, which has the joint affect of greatly enhancing the readability of the dial and time from any angle (including under water), and increasing the water resistance of the watch even at great depths.

  • View Sinn watches with Hydro Oil Filled technology.

Submarine Steel

Sinn has created a line of watches featuring cases made from German submarine steel (the U Series). The steel was procured by Sinn from a steel supplier to Emden GmbH, one of Germany's North Sea shipbuilding yards who construct submarines from the very same steel.

Because of the special steel used from the submarine steelmanufacturer, the case resists the effects of exposure to salt waterand salt water environments.

These cases are produced in-house by Sinn's case making affiliated company in Glashutte, Germany.

This special steel is also amagnetic which means that is does not have magnetic properties and cannot itself become magnetized. The watch movement itself is protected from magnetic fields up to 4,800 A/m.

  • View Sinn watches built from German submarine steel.

EZM Mission Timers

Sinn is a partner for manufacturing watches for the German Special Forces, including SWAT, Customs, FBI, helicopter police, GSG9 and other units.

Beginning with the now highly collectible (and valuable) Sinn EZM 1, Sinn has grown this collection to some of the most durable and highly functional watches made and they remain among the most popular in the collection.

  • View Sinn watches in the EZM Series.

TESTAF Certified Pilot's Watches

Lothar Schmidt, Sinn's CEO and owner had long been disturbed by a lack of technical standards for defining a "pilot's watch". As an engineer, Mr. Schmidt was fluent in standards for diver's watches, anti-magnetic watches and the many other technological standards used to manufacture watches.

A widely used reference for standards is DIN, or the Deutsches Institut fr Normung (German Institute for Standardization). Oddly, he discovered there were no DIN standards to cover pilot's watches where such standards existed for example for diver's watches.

The new "Technical Standard for Pilot's Watches" (TESTAF) was developed by the Aachen University of Applied Sciences and establishes the suitability for professional use as a pilot's watch.

  • View Sinn watches in the TESTAF Series


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