A gentleman's wristwatch of steel. Model Marine II. Mechanical movement with manual winding. Two-tone dial with blued hands. Mounted with a later brown leather strap. Case W. 22 mm. Circa 1940.
Omega Marine was launched in 1932 and was the first watch ever to be tested at a depth of 70 meters.
Literature: Omega Museum:
... The 1932 OMEGA “Marine” accompanied the father of modern diving, Yves Le Prieur, on many of his dives and American explorer Charles William Beebe took the OMEGA “Marine” to a depth of 14 metres as early as 1936...