This is the ultimate diver's chronograph watch - the Sinn U1000 EZM 6 Chronograph. This watch is packed with so much technology that fitting it all on one page is difficult.
The Sinn U1000 is of course part of the best selling Sinn U series of diver's watches. Initially released three years ago, this series is constructed from the same steel that is used on 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. 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.
Next, the Sinn U1000 features a completely Tegimented case, pushers, bezel and crown. 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 on this watch has a hardness of 1,500 Vickers which is more than six 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. This process increases the submarine steel's resistance to corrosion, as well as provides extreme protection from scratches and other damage to the case.
Next, a discussion of water resistance. This watch represents a breakthrough on the testing of chronograph functions at great depths. The watch is not only rated water resistant to 1,000 meters, the pushers and operation of the chronograph have also been tested to that depth with certification from the international testing lab Germanischen Lloyd.
Sinn has developed a special system of double Viton seals and other engineering processes to achieve this certification. While building a 1,000 meter dive watch is not in itself unique, building a diver's chronograph whose functions have been tested at that depth is an achievement.
Inside the Case
What's inside this watch also shows how Sinn engineers watches like no other. The base movement is a top grade Valjoux 7750 which Sinn has modified to create their SZ-02 calibre. The primary modifications consist of a
redesigned minute register which actually counts 60 minutes rather than the typical 30. This register has been enlarged and is placed at 6, with the primary hour register located at 12.
To counter the effects of moisture and humidity, Sinn has applied their "Dry Hold" technology to this model, consisting of four copper sulphate capsules and the use of inert gasses sealed within the case.
The Bezel - Lock and Push
This watch features a brand new bezel design from Sinn. First, the bezel is attached to the watch with screws rather than friction mounted. These screws prevent the bezel from becoming detached through accidental contact with other objects. Next, the bezel is locked in place and will turn only if downward pressure is applied. This "lock and push" system ensures that time sensitive events (such as dives) will be correctly measured.
EZM Design - EZM 6
Sinn is known for their professional special forces watches, called the Einsatzzeitmesser (EZM - in English "Mission Timer") series. Sinn has long been a supplier of watches to various divisions of the German special forces, including the GSG-9, border protection, customs, military and special police divisions. Designing watches for these units carries a number of requirements, including resistance to shocks, water, magnetism and temperature changes among others.
There is also a functional requirement in that the watch must be highly legible and the controls must be both accessible and easy to use in extreme environments. This watch takes its place as the new Sinn EZM 6, and you'll notice that the crown and pushers have been relocated to the left side of the case as is typical for EZM watches.
We know - this is a lot of information for one watch. But we feel it's important to understand what's behind a watch of this caliber. In summary, these are the points that make this watch stand out from what you are likely to see during your next visit to a watch retail store:
- Full Tegiment construction - six times harder than standard steel watches
- Case constructed of submarine steel for superior resistance to corrosion and scratches
- Double Viton seals
- Modified SZ-02 movement with redesigned 60 minute register
- Four Sinn copper sulphate capsules to absorb moisture and humidity
- Inert gasses have been inserted into the case to promote a dry and stable environment
- Bezel is screwed to the case using an exclusive Sinn design
- Bezel is locked into position and will rotate only when pushed down
- Built to the standards of the German special forces - EZM 6
- Double coated anti-reflective sapphire crystal hardened with Tegiment process
- In house case construction from Sinn's affiliated company in Glashutte, Germany
This watch ships on a Sinn rubber strap and tegimented buckle.