Omega, 33.3CHRO powered, water-resistant, chronograph, 38 mm dial size, stainless steel, circa 1940s. The water-resistant case of the early model with an engraved back, the black and gray two-tone dial with white enamel, and the multi-colored and scale design with pulsation scale make this watch one of the best of the 33.3 chronographs, which is a rare and precious watch among the precious water-resistant cases. It is an Omega chronograph that has been appreciated in recent years for its colouring, elaborate dial design and oversized case, which is not seen in other well-known brands of its age such as Patek Philippe, Rolex, Longines and Universal.