One of a 1000 piece limited edition watch constructed from the U15 decommissioned German Navy submarine.
All the steel used to fabricate the bezel, case and bracelet came from the sub.

Sinn was able to get this boat and two others: the U16 and U18. Each submarine yielded 1000 watches. I chose the U 15 as it was the smallest of the three: 41mm in diameter and under 11mm in height. Itβs water resistant to 500 meters, which is 499 more than I need.