A U-boat stopwatch by Junghans Watch for the estimation of the sink and approach speed of water bombs. Made by Junghans, movement cal. 29c, marked no. "9638U" and "29C". White face with
Junghans Stopwatch, Year Produced: 1910, 29 a, U Boat - to - Catawiki
Junghans Pocket Watch Luxury Stopwatch Good Condition 55mm – Murphy Johnson Watches Co.