Back to the future The spirit of Oris’s first diver’s watch, introduced in 1965, continues to inspire the form of the Divers Sixty-Five, only now it’s equipped with Oris Calibre 400, our game-changing automatic. Oris’s engineers developed Calibre 400 to meet the demands of today’s watch wearer. It makes three key performance promises: anti magnetic, five day power reserve and a 10 year warranty.