U-Boat Caliber U-28

Manufacturer	U-Boat
Caliber Number	U-28
Base Caliber	ETA 2824-2
Vibrations Per Hour	28,800 bph
Power Reserve	38 hours
Jewels	25
Functions	Hours, minutes, seconds, date
Country of Manufacture	Switzerland
Known Models	U-1001 (ref 6949)

According to U-Boat this movement was:

…modified and personalized to U-Boat specifications for stem position at 9 o’clock.