Sinn EZM 3 on Bracelet

SKU: SI-031

Watch Brand: Sinn

Learn more about Sinn watches
Automatic winding mechanical watch in steel on bracelet
• Case diameter (mm): 40.0
• Case thickness (mm): 13.0
• Case lug width (mm): 20
• Lug to lug (mm): 47.5
• Weight - head only (grams): 81
• Front crystal: Sapphire
• Case back: Solid
• Case finish: Matte
• Case metal: Stainless steel
• Dial color: Black
• Inert gas: Filled
• Copper sulphate: Capsule
• Antimagnetic: 80,000 A/m
• Movement: Automatic mechanical
• Manufacturer's limited warranty: 3 years
• Warranty service: RGM or Sinn
° Earn 4100 WatchPoint Rewards on this purchase
WatchBuys Direct Price: $2,050.00
Availability: In Stock - Ships Immediately

Sinn EZM 3 on Bracelet
Sinn EZM 3 on Bracelet
Product Details

The Sinn EZM 3 on bracelet is the last of the original Sinn EZM series of watches, designed for extreme conditions (the Sinn EZM 1, EZM 2 and EZM 4 models have all been retired). The inert gas filled watch cavity and dehumidifier capsule prevent fogging by guarding against moisture intrusion, and special micro-lubricating techniques allows for operation down to -45 degrees Centigrade.

The case has an iron core to protect against extreme magnetic fields. Sand-blasted stainless steel case with rotating elapsed time bezel. Reversed screw down crown and matte black dial with luminous hands and markings.

This is the perfect mechanical watch for extreme conditions, whether they be water depth (water resistant to 50 ATM), temperature or magnetic fields.

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 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.

Please also 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 FedEx. 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. Among the more popular features 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 layer has a hardness of 1,200 Vickers which is five times harder than standard steel (and on some Sinn models even higher - up to nine times harder than standard steel).

The Tegiment layer 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 even further improved by the Tegiment hardening process.

The primary advantage to a Tegimented case is extreme resistance to scratches and other case abrasions.

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 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.

Another advantage to this technology is that it prevents the dial and crystal from fogging. 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 knowing so – frequent high altitude flying, metal detectors, audio and video equipment, medical equipment and computer equipment to name a few.

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, "Diamantpaletten”) 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, and each movement is a certified chronometer.

By using this type of movement, Sinn is able to fill the watch with oil, which has the double 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 exist 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


Watch Reviews

Incredible Watch

"Incredible Watch"

Jason C

Comments about this watch: This was my second Sinn but my first purchased new and my first experience with WatchBuys. 

I can honestly say that both aspects were an excellent experience. 

Starting with the excellent customer service and finishing with receiving my EZM 3 the watch is a masterpiece. The blasted finish is flawless and it's keeping perfect time. This is a seriously impressive timepiece and well worth the money.



Michael S.

Comments about this watch: This is my favorite Sinn.

Just like any Sinn watch, the build quality is excellent. Perfect dimensions. Thin enough to slide under a shirt cuff. Versatile, able to dress up or down. Amazing technology! It's just an all around great watch. The bracelet fits very nice and is easy to size with the included tool.

Customer service, as always, was superb.

Better than Expected

"Better than Expected"


Comments about this watch: I have to say that when I received my EZM3 I was blown away.

It wears larger than it's 40mm size would suggest. Fit and finish are typical Sinn that is to say excellent. Great Watchbuys service to boot.

A can't miss in my opinion.



Chris H.

Comments about this watch: Perfect "use any time, go anywhere" watch.

Purposeful built, yet dress watch size and handsome looks. The reason the date wheel was done in red is to separate those numbers from the white numbers going around the dial. Would have looked pretty cluttered there around 4 o'clock. Actually makes sense, and the date is still there for you.

EZM 3 on Strap

"EZM 3 on Strap"


Comments about this watch: I Like the watch a lot. But the red date is hard to read.

I am used to wearing 42-44 mm watches and I was worried about the 40mm case. It wears big and I love feel of it. I can say it has been a long time that I could wear a watch all day and forget I have one on. The weight for me is perfect.

It's a keeper.


"EZM 3"


Comments about this watch: A watch made for the German Border Forces was a fitting choice for my own profession here in America. My proclivity for this watch over other divers was its reasonable size of 40 mm.

The EZM 3 is appropriate for any setting from formal business meetings to guarding the border. As others have stated, the only feature for which this watch can be criticized is its date wheel. The selected color is difficult to read when ambient light is moderate to low luminosity. Sinn designed this watch for nonessential information to disappear during operations. Unfortunately, this feature works all too well.

Nevertheless, the EZM 3 is still a great choice and a worthy addition to any collection.

Great Watch

"Great Watch"


Comments about this watch: Very high quality, perfectly sized watch. Much more wrist presence than I thought it would have. Very rich looking and combination of anti-reflective crystal and bezel is very handsome. Mine keeps great time.

A little weird getting used to the reverse crown location but it was intended as a functional dive watch. Negatives? Lume doesn't last long and the date is almost impossible to read (red like the Argon label). You can wear this as a casual watch but it looks fine with a suit. Versatile and classy. I get lots of compliments.

Love it.

Great Watch

"Great Watch"

Kyle P.

Comments about this watch: Excellent.

Bead blasted finish extremely scratch resistant, perfectly legible dial, and a great size.

Amazing watch

"Amazing watch"


Comments about this watch: Solid, elegant, keeps excellent time ... looks amazing on Sinn rubber strap.

EZM3 quietly annihilates the competition with superior build, function, durability, aesthetics and exclusivity

"EZM3 quietly annihilates the competition with superior build, function, durability, aesthetics and exclusivity"


Comments about this watch: Kudos to Sinn for maintaining a course of innovation and design.

The EZM3 is the quintessential tool watch yet it can transition effortlessly to the finest suit and feel right at home. The EZM3 will keep subs in hiding under their owners sleeves.




Comments about this watch: Perfect size. tough and VERY legible.

Only thing I would change would be the RED date wheel (not sure what they were thinking)


"EZM 3"

Sean F.

Comments about this watch: Awesome, last of the great EZM tool watches.

Get one while you can. Love mine.

One of Germanys best!!

"One of Germanys best!!"

M McKenzie

Comments about this watch: This watch is just what I was looking for and much more.

The technology packed into this compact functional package is impressive. It is my "do it all" watch and it does it all as advertized. Easily my most useful, most worn watch.

Excellent value!



Detlev W.

Comments about this watch: A very good investment and a great watch to wear daily.

The best of the Sinn line

"The best of the Sinn line"


Comments about this watch: Admittedly I am biased, but this is among the most attractive tool watches there is and a "good value" compared to an EZM1 (used), Rolex Sub or other higher end watch.

I really like the brushed dial. It actually stands out is a sea of polished metal bracelets!



M Garnsey

Comments about this watch: I love mine

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