Sinn U1

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The Sinn U1 is a dive watch by Sinn.

The case of this dive watch is manufactured from submarine steel. Conventionally stainless steel for the watch case has no real resistance to sea water. Strictly seen such cases are not suitable for permanent use in sea water. In search of a steel, which meets the higher quality requirements, the Sinn engineers eventually made a find at the German submarine shipyard Howaldtswerke-Deutsche Werft and the Nordseewerke Emden/GmbH: steel from the current German submarine production is exclusively delivered.

This material is not only extremely resistant to sea water, but has also the highest anti-magnetic quality. A residual magnetism still occuring in the conventional and high-quality stainless steel watch cases of grade 316 L, is not possible in the case of submarine steel.

Another major advantage of this steel for watchmakers lies in its special property to be tegimented. The submarine steel can be hardened to 1500 Vickers. Thus, the previous hardness of the Sinn tegiment case is exceeded by about 300 Vickers. For comparison, the base hardness of conventional stainless steel (316 L) is approximately 220 Vickers.

Another special feature of this watch is the captive and hardened diving bezel. To avoid removal of the rotating ring by hard knocks, it is not connected with the middle part of the case by a snap mechanism as usual, but a newly developed mounting device holds it securely in place. The detent is ball-mounted three times; slightly radially offset locking ball positions conserve the ring gear, ensure the function and provide a solid and secure engagement.


Mechanical movement ETA 2824-2, 28,800 A/h
Shock proof according to DIN 8308
Antimagnetic according to DIN 8309


According to technical requirements of the dive watch standard DIN 8306
Submarine steel, bead-blasted
Ø 44.0 mm, height 14.3 mm
Weight 113 g
Domed sapphire crystal with anti-glare treatment on both sides
Screw-in crown
Waterproof to 1,000 m


Hours, minutes, seconds with hacking seconds
Date indication
Captive safety diver's bezel with luminous triangle


Black, indexes with special white, long-lasting luminous paint
Hours and minutes hand with special white, long-lasting luminous paint
Central seconds hand in red, partially covered with white luminous paint


Silicone bracelet with diving extension or solid stainless steel bracelet, tegimented


2 years


Production: 2005-Present