A Bulova Accutron Snorkel 666 feet "Devil Diver" wristwatch, circa 1960's. Model reference 7810,41 mm cushion shaped stainless steel case,Bulova Electronic Cal. 2182 Acutrontuning fork movement.An inner 60-minute rotating bezel has the first fifteen minutes highlighted in cream. Applied baton indexes mark the hours sitting on a black inner dial ring with a day/date window at 3 o'clock. Acrylic crystal glass. Mesh style integrated bracelet with folding clasp. In running condition. Comes with box, without paperwork. The name "Devil Diver" comes from the 666ft depth rating. Max Hetzel, a Swiss engineer, was recruited in Bienne in 1950, he developed a movement replacing the balance with a U-shaped tuning forkfitted between two transistors which increased the watch's precision considerably. In 1952 Bulova started the development of the Accutron, the world's first fully-electric watch. '