- Case and crown made of high-strength, seawater-resistant German Submarine Steel
- Bezel with TEGIMENT Technology and therefore especially scratch-resistant
- Diameter of case: 44 mm
- Tested based on European diving equipment standards and certified by an independent institute
- Captive diver's bezel with minute ratcheting
- Crown at 4 o'clock to prevent pressure on the back of the hand
- Sapphire crystal glass
- Water-resistant and pressure-resistant to 1,000 m diving depth (= 100 bar), certified by an independent institute
- Low pressure resistant
With the diving watch U1, Sinn engineers succeeded in developing a diving watch in which the quality of material and design gives it superior resistance to external influences under extreme conditions of use.
In their search for a steel with the desired resistance, the Sinn engineers found what they were looking for at the German submarine manufacturer ThyssenKrupp Marine Systems: the steel manufacturers supply small quantities of the original steel of the current German submarine production exclusively to Sinn for making diving watches — the very steel of which the external hulls of the German Navy's new submarine class 212, which currently represents the most advanced non-nuclear submarines in the world, are made. This original submarine steel is not only extraordinarily seawater-resistant but is also of the highest non-magnetic quality without any residual magnetism.
To ensure reliably that the rotating bezel of the diving watch does not detach under harsh impacts, it is attached as a captive bezel to the central part of the case.
The water-resistance and pressure resistance of 100 bar (= 1000 m water depth) was certified for the diving watch U1 by DNV. The safety test pressure used for this purpose was 125 bar.
Technical details
Self-winding mechanism
26 bearing jewels
28,800 semi-oscillations per hour
Seconds stop function
Anti-magnetic as per DIN 8309
Sapphire crystal glass in front, anti-reflective on both sides
Case back screw-fastened
Crown screwable
Meet the technical requirements for water-resistance, as set out in standard DIN 8310
Water-resistant and pressure-resistant to 1,000 m diving depth (= 100 bar), certified by an independent institute
According to the technical demands for the diving norm DIN 8306
Tested based on European diving equipment standards EN 250 / EN14143 and certified by an independent institute
Low pressure resistant
Date display
Diver’s bezel with minute ratcheting and luminous key mark
Captive bezel
Band lug width: 22 mm
Case thickness: 14.7 mm
Weight without strap: 113 gramme
Indices coated with luminescent colour
Hour, minute and second hand coated with luminescent colour