Launched in 1965 as a successor to the Memovox Deep Sea, the Polaris was Jaeger LeCoultre's response to the ever-increasing popularity of recreational scuba diving. Developed for the American market and designed in a massive 42 mm.case, it featured an internal revolving bezel as well as an alarm function and a date. Equipped with the Jaeger caliber K825 that revolutionized the watch world a few years before as the world's first automatic alarm watch, the Polaris offered divers reliability and endurance. The first generation was fitted with a plain full back and a dial with applied baton indexes, the second generation of 1967-71 were drilled for better sound emission and a dial with large luminous indexes. The first and second generations of the Polaris was made in a total of only 1714 pieces over a 6 year period between 1965 and 1971, this model is rare. Most were made for the American market, so the dials were usually signed only LeCoultre.