The Sinn U1 diver's watch is a feat of engineering excellence, with exceptional material and design quality. The watch is resistant to external influences, even when worn in extreme conditions. To build this watch, Sinn used small quantities of original steel from current German submarine production.

Seawater-resistant and non-magnetic

This original submarine steel is not only extremely seawater-resistant, it also has maximum non-magnetic properties without any residual magnetism. To secure the bezel of the diver's watch against hard impacts, it is permanently connected to the middle part of the case. The 100bar* water resistance and pressure resistance of the U1 diving watch was certified by DNV GL. The safety test pressure applied was 125bar.


  • Size (ø): 44mm
  • Strap length: 220mm
  • Strap width: 22mm
  • Weight: 220g
  • Material: submarine steel, stainless steel, sapphire crystal glass
  • Colour: stainless steel/black


  • Mechanical movement SW 200-1
  • 26 ruby bearing jewels
  • 28,800 semi-oscillations per hour
  • Second-stop mechanism
  • Self-winding
  • Waterproof to 100bar*
  • Anti-magnetic to DIN 8309
  • Resistant to negative pressure
  • Case and crown made from high-strength, seawater-resistant German submarine steel
  • Captive diver bezel with minute ratcheting
  • Matte black dial
  • Folding clasp, safety bar and diver extension
  • Made in Germany

Included in delivery

  • Sinn U1 SDR Automatic Diving Watch

*Waterproof to 100bar and therefore suitable for showering, bathing, swimming and scuba diving. Certified by DNV GL.