Caliber: Seikoself-winding caliber 6217A
The “62MAS” is the first professional Seiko dive watch.
Seiko introduced the 62MAS in 1965 and it was the original professional dive watch from the Japanese company. The nickname “62MAS” comes from the first two digits of the reference number – 62 – and MAS from “auto[MA]tic [S]elfdater,” AKA an automatic movement with date. The 62MAS features a quick-set date, which was innovative at the time, as many other brands time did not yet have the capability. Many design elements of the 62MAS are seen in other Seiko dive watches through the years. The dials on these watches is a very interesting grey-green color that can look different depending on the light
Seiko used a smaller crown at the beginning of the production run for this watch in 1965.