Blancpain, Fifty Fathoms, n° 4620, around 1955.

A fine & rare, oversize, diver’s wristwatch, originally developped for the French navy commandos, later used by the Cousteau diving team. Wide graduated black bezel, black dial, alternate Arabic numerals & indexes, luminous hands & indexes, screw-back, protective dust cover, automatic winding movement.

Diam 42 mm