Sinn - U1 SDR

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.

Mechanical Movement

• SW 200-1
• Self-winding mechanism
• 26 bearing jewels
• 28,800 semi-oscillations per hour
• Seconds stop function
• Anti-magnetic as per DIN 8309

Case

• Case made of German Submarine Steel, bead-blasted
  
• Sapphire crystal glass in front, anti-reflective on both sides
• Case back screw-fastened
• Crown screwable
• Meet the technical requirements for waterproofness, as set out in standard DIN 8310
• Waterproof and pressure-resistant to 1,000 m diving depth (= 100 bar), certified by DNV
• According to the technical demands for the German diving norm DIN 8306
• Tested based on European diving equipment standards EN 250 / EN14143 and certified by DNV
• Low pressure resistant

Functions

• Hours, minutes, seconds
• Date display
• Diver’s bezel with minute ratcheting and luminous key mark

SINN Technologies

• Bezel with Black Hard Coating on a TEGIMENT Technology basis
• Captive diver's bezel

Dial and Hands

• Matte black dial
• Indices coated with luminescent colour
• Hour, minute and second hand coated with luminescent colour

• Case diameter: 44 mm
• Band lug width: 22 mm
• Case thickness: 14.7 mm
• Weight without strap: 113 gramme