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Sinn U1 Divers Automatic Wristwatch. NWW 1440
  • TypeModern
  • BandFabric Strap
  • Case MaterialSteel
  • ConditionExcellent
  • MovementAutomatic
 

Sinn U1 Divers Automatic Wristwatch.

Used but good condition Sinn U1 on nato strap, originally bought from us in 2009.  It comes complete with box and papers, and two clasps for a silicone strap, booth in used condition. The U1 and U2 cases are made from stainless steel that used in the construction of the outer hull of submarines. The steel was by procured by Sinn from a steel supplier to Emden GmbH, one of Germany’s North Sea shipbuilding yards who construct submarines from the very same steel. This submarine steel is not only extraordinarily sea water resistant (PRE value up to 38), it possesses also the highest anti magnetic quality. The Uni directional ratchet operated rotating bezel is Tegimented where the steel can be hardened on up to 1500 Vickers. Compared to regular 316 L stainless steel which is hardened to approximately 220 Vickers. The indices are machined directly into the bezel without the use of bezel inserts, which can corrode or come loose at deep depths. The watch has the bezel hardened to 1,500 Vickers by the use of Sinn’s tegimented treatment in the Sinn laboratory. Has a sapphire crystal with anti reflective coating, screw down crown with three gaskets and is water resistant to 1000 metres to DIN 8306 specification. The watch has the ETA 2824-2  automatic movement, operating at 28,800 beats per hour, shockproof according to DIN 8308 specification and anti magnetic according to DIN 8309 specification. It operates in temperatures between -45° Celsius to +80° Celsius due to the special lubricants in the movement applied in the Sinn laboratory. Super Luminova luminous broad hands and dial markings for maximum legibility. Functional and utility looking red and white hands and sweep second hand. Comes on silicone strap with double push button deployant buckle and fliplock safety clasp. Outstanding watch. Width is 44mm, lug to lug is 50 mm, Thickness is 14.5mm.

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