Sinn U2 EZM 5 on Strap

The Sinn U2 case is made from the same German steel that is also used in the construction of the outer hull of submarines. The steel was 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 special steel is also amagnetic which means that is does not have magnetic properties and cannot itself become magnetized.  The watch movement itself is protected from magnetic fields up to 4,800 A/m.

Because of the special steel used from the submarine steel manufacturer, the case resists the effects of exposure to salt water and salt water environments.

The uni-directional ratchet operated rotating bezel is also milled from this submarine steel which is Tegimented. The indices are machined directly into the bezel without the use of bezel inserts, which can corrode or come loose at deep depths. The international testing lab of Germanischen Lloyd has tested the U2, and determined that the watch can be certified as water resistant to 2,000 meters. This same firm tests submarines for their ability to withstand the effects of underwater use.


The Sinn U2 has full UTC functionality through the use of an additional short red tipped hour hand which can be set independently from the primary time zone and indicates the second time zone using a 24 hour display. Screw down crown. The U2 features an inert gas filled cavity with two copper sulphate humidity absorbing capsules, which are visible at 6.

Matte black dial with date at 3, Super Luminova on hands and markers, and striking red seconds hand complete the design. Other features include sapphire crystal with hardened anti-reflective coating, and silicone rubber strap with double push deployant buckle and fliplock safety clasp.