The Sinn U15, U16 and U18 diving watches embody much more than timekeeping – they are testimonies to a key chapter in the history of the German Navy. Made from the steel of their namesake type 206 submarines U15, U16 and U18 type 206 submarines, they are steeped in history and are guaranteed to delight naval enthusiasts and watch connoisseurs alike.

Model Specifications 1025.010:

• This model is limited to 1,000 pieces worldwide. 
• A case made of high-strength, seawater-resistant German Submarine Steel frames the dial. The steel for the case has come from the decommissioned submarine U15. 
• A captive diver's bezel made of German Submarine Steel also frames the dial. To ensure the bezel is scratch-resistant it has been treated with TEGIMENT Technology. 
• The screw-fastened case back features a silhouette of the Type 206 submarine.
• The screwable crown is positioned at 4 o'clock to prevent pressure on the back of the hand. 
• The watch uses scratch-resistant sapphire glass to protect the dial. The glass has been treated with an anti-reflective coating on both sides for exceptional clarity. 
• The high-gloss blue-green dial features luminescent indices and luminescent hands as well as a date aperture at 3 o'clock. Stylised air bubbles that symbolise the rising air bubbles underscore the three-dimensional effect with metallic blues and greens.
• The dial also features the number of nautical miles travelled and the U15's type designation. 
• This watch is water-resistant and pressure-resistant to 500 metres diving depth, as certified by an independent institute. It meets the technical requirements for water resistance as set out in standard DIN 8310. The water resistance is aided by the screw-fastened case back and screwable crown. The watch is also resistant to low pressure. 
• An SW300-1 self-winding mechanism powers this watch. It uses 25 bearing jewels and 28,800 semi-oscillations per hour to power the watch. The movement features a stop seconds function and is anti-magnetic as per DIN 8309. 
• The watch has a 41mm case diameter, a 20mm band lug width, and an 11.2mm case thickness. It weighs 74 grams without a strap. 
• The watch is finished with a satinised solid stainless bracelet that fastens with a deployment clasp.