This is a rare WW2 German Kriegsmarine U-Boat 541 bulkhead clock, this one was taken of the U-Boat 451 when it surrendered of the coast of Gibraltar. This one is still in good working order and comes with a key, the face has pitted due to the seal not being great and salt air getting to it. The face has the number 14890, also on the back of the clock is has the number U-541 which can just be made out and the number 12283 on the back.