Sinn U2 EZM 5 on Silicone Strap

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• Verified Watch Owner Reviews (16 reviews)
SKU: SI-121

Watch Brand: Sinn

Sinn North America

Mechanical diver's watch with two time zones
• Watch diameter (mm): 44.0
• Watch height (mm): 15.5
• Lug width (mm): 22
• Lug to lug (mm): 50.5
• Weight - head only (grams): 114
• Water resistance: 2,000 meters
• Case back: Solid
• Case finish: Matte
• Case metal: Submarine steel
• Dial color: Black
• Front crystal: Sapphire
• Tegimented: Bezel only
• Inert gas: Filled
• Calibre: SW330-1
• Copper sulphate: Capsule
• Movement: Automatic mechanical
• Strap or bracelet: Strap
• Manufacturer's limited warranty: 3 years
• Warranty service: RGM or Sinn

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WatchBuys Direct Price: $3,160.00
Availability: Temporarily Sold Out

Sinn U2 EZM 5 on Strap
Sinn U2 EZM 5 on Silicone Strap

(Click Image to Enlarge)
Product Details

Step up to the EZM 5 Professional Series with the Sinn U2. The technology and design elements used to create the Sinn U2 go far beyond standards used at most watch companies.

The Sinn U2 contains all the great features of the Sinn U1, but adds the following:

  • Second time zone complication indicated by a red tipped hour hand
  • Increased water resistance to 2,000 meters
  • Special inert gas mixture
  • Two copper sulfate absorbing capsules
  • 4.6 mm thick sapphire crystal

The Sinn U2 case is made from the same German 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 Germany's 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 which 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 U2, and determined that the watch can be certified as water resistant to 2,000 meters. This same firm tests submarines for their ability to withstand the effects of underwater use.

The Sinn U2 has full UTC functionality through the use of an additional short red tipped hour hand which can be set independently from the primary time zone and indicates the second time zone using a 24 hour display. Screw down crown.

The U2 features an inert gas filled cavity with two copper sulphate humidity absorbing capsules, one of which is visible at 6.

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 hardened anti-reflective coating, and silicone strap with double push deployant buckle and fliplock safety clasp.
Frequently purchased with this item:

Watch specifications are provided by the respective watch manufacturer and/or other sources. Although we use best efforts to provide accurate information, we reserve the right to make corrections when advised of specification changes and/or content errors.

WatchBuys is the official and authorized North American distributor and importer for Sinn watches.

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 and importer, 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 Sinn Authorized Service Center, RGM Watch Service located in Mount Joy, Pennsylvania. This added benefit saves our clients the time and effort of returning their watches to Germany for repair. This service 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 click here for instructions on returning your 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 UPS 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.

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.

Watch Reviews From Verified WatchBuys Buyers
100% • Verified Watch Owner Reviews100% • Verified Watch Owner Reviews (16 reviews)

Sinn U2 - Outstanding Tool Watch

"Sinn U2 - Outstanding Tool Watch"

Verified Watch Owner Comments: I am beyond impressed with this Sinn U2. I anticipated it would be much larger than it is, but it fits my 7 wrist perfectly. Even with the domed sapphire crystal, visibility is perfect from many angles. Even though it's a pretty heavy watch, the 4 o'clock crown makes it super comfortable to wear.

Watchbuys has also been great to deal with. Highly recommend this timepiece and this company!

Tough tool watch

"Tough tool watch"

Verified Watch Owner Comments: This is a tool watch through and through. I love how purpose-built it feels. It is highly legible, with a big, bright lume plot at zero on the bezel. The second time zone is also well-executed, dropping into the background when you’re focused on the main time, but right there when you need it. Finally, the technical features are great: huge water resistance, captive bezel, dehumidifying capsule visible at 6 o’clock, antimagnetic. All in all, a hard working, well designed watch.

Sinn is absolutely amazing

"Sinn is absolutely amazing"

Verified Watch Owner Comments: I just picked up the Sinn U2 EZM5. The pictures online do it no justice, it is spectacular. Right away you feel the heft and presence of this watch.

You can tell this is a piece of equipment made to perform in every respect. At the same time it is classy and refined with an everyday wear appeal. Sinn has a winner with this watch. If you are looking for a true dive watch ready to be used as intended or just looking for something that not everyone has, you have to check out this watch.

As always Watchbuys was amazing, buy from them with complete confidence.

Great Buying Experience

"Great Buying Experience"

Verified Watch Owner Comments: Sinn U2 EZM 5 - a great buying experience!

Sinn U2

"Sinn U2"

Verified Watch Owner Comments:

Awesome watch and strap. Presents small for a 44mm case however, combined with the weight and strap dimensions, its an imposing timepiece. Extremely legible dial and great features. Be careful when trimming the strap down to size and do it in stages. Once cut, it's irreversible, and replacement straps are expensive.

Outstanding communication and customer service from Watchbuys!

Great watch - Great WatchBuys

"Great watch - Great WatchBuys"

Verified Watch Owner Comments: This is a wonderfully crafted watch and as durable as they come. The quality and design is outstanding.

WatchBuys was great about answering questions at time of purchase. Unfortunately, about 6 months after I received the watch, it stopped working. As I was in Japan at the time, I had an authorized repair shop (this watch is gas-filled so you don't want to take it to just any shop) do the repair. Cost me about $100 to fix, but haven't had any trouble since.

This experience should not deter you from purchasing this watch. It is one of the best in my collection!!

Sinn U2

"Sinn U2"

Verified Watch Owner Comments: The build quality of the U2 is superb; easily on par with Rolex, Omega and Breitling which I've owned.

The watch is big, but does not feel big on the wrist. Face is extremely legible. Very pleased with this watch.

The service I received from WatchBuys was second to none. Matt even answered a general question on a Saturday - even though WatchBuys isn't open!

Watch arrived as ordered, brand new in box and with no surprises. Sinn is a great brand. WatchBuys is a great retailer.

Super Watch!

"Super Watch!"

Verified Watch Owner Comments: Comfortable to wear,easy to read by day and night, super bold and solid, great design and my favorite sports and action timepiece !!!

Sinn U2 EZM 5

"Sinn U2 EZM 5"

Verified Watch Owner Comments: One of my two best timepieces, the other being the Sinn U1000S EZM 6.

Build quality is superb and robust.

Sinn U2

"Sinn U2"

Verified Watch Owner Comments: Toughest mechanical diver money can buy, with technical features such as Argon filled case and copper sulphate dehumidifying crystals.

Top notch movement and great subtle looker. One for afficionados...


"EZM5 U2"

Verified Watch Owner Comments: Impressive weight! As always the U series is a no brainer especially when it's an EZM watch.

I strongly recommend picking up the leather strap with red stitching as well...simply stunning!

Sinn U2

"Sinn U2"

Verified Watch Owner Comments: Deceptively comfortable watch with a tasteful "tactical" appearance, exceptional overall quality, and superb scratch resistance.

Sinn U2

"Sinn U2"

Verified Watch Owner Comments: i can beleive the U2 is full of super quality and feeling when putting on my arm.

I love it, even more than my Panerai

U 2

"U 2"

Verified Watch Owner Comments: Superb! Great to wear despite weight and size. No sharp edges that catch clothing. Excellent timekeeping.

Superior to my other dive watch, a Rolex Submariner.

U2 Rocks

"U2 Rocks"

Verified Watch Owner Comments: I love it!

Sinn U2

"Sinn U2"

Verified Watch Owner Comments: Nice watch. Size and heft are impressive , just the right combo.

Tough well put together watch . An eye-catcher to " Boot " ( pun intended ).