Seiko 62MAS
Japan's first diving watch, used by researchers in Antarctica.
Seiko made its first diving watch in 1965. It was used by Japanese expeditions in Antarctica and began a long line of Seiko diving watches. The model has since been reissued in new versions.
Materials: Stainless steel; self-winding movement
Manufacture: Made in Japan; the case was waterproof to 150 metres.
The rotating bezel and the large markers.
The plain steel case with the crown at three.