Seiko 62MAS (1965)

This was Japan’s first diver’s watch. It was an automatic 150m Diver’s. The launch of this model marked the start of Seiko’s pursuit for ever greater reliability and safety. In 1966, the watch proved its reliability and precision on the 8th Japanese Antarctic Research Expedition. The 6217-8000/1, which is better known as the Seiko 62MAS (autoMAtic Selfdater)Stainless steel case at 37mm. It featured a date function, a bi-directional bezel, stronger luminosity on the hands and indexes, and a big crown. It has a screw down case back but non-screw down crown. The Seiko 62MAS was rated to 150M of water resistance. While this doesn’t seem like a lot by today’s standard, it was Seiko’s deepest rating at the time (prior watch was rated only to 50M). The 6217-8000/1 caliber is a 18,000bph automatic, non hacking seconds with quick set date.