Clock produced by E. Boselli of Milan (Italy), specifically designed to be installed on board a submarine of the Royal Italian Navy. On the back there are the trademarks of the Royal Maritime Military Arsenal of La Spezia, that is, the clients who would subsequently install this watch inside ships or submarines.
The watch, completely made of "Marine Bronze", bears the award and acceptance marks of the Royal Italian Navy on the dial.
A very small layer of silvering is still present on the dial.
Inside the submarines, clocks were installed in every department: from the Officers' Quarters, to the engine room, radio room, etc.