1956 Omega Seamaster Automatic Wristwatch Model 2846 with Rare Cross Hair DialThis Watch The first Omega Seamasters was based loosely around waterproof watches made for the Royal Navy. What made the Seamaster appealing was using an O Ring gasket which gave it temperature and depth resistance. In 1955, the Swiss Laboratory for Watch Research tested out 50 Seamaster cases with a 60 meter depth rating. Omega was so confident that they strapped one to the outside of a plane and flew it over the North pole in 1956. The very year