Seiko 6217-8001 "62MAS"
Year: 1966 April
Case No: 6429437
Material: Stainless steel
Dimensions: 37mm diameter; 13mm thickness
Lume: Yes, tritium
Caliber: Automatic caliber 6217A
Service history: April 2020, currently running at 22 sec/day
Bracelet/Strap: Grey strap (pictured)
Lug Width: 19mm
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. This particular example is the “big” crown variant produced by Suwa Seikosha from January 1966 to June 1967.
Overall, this Seiko is in really nice condition. The case has been polished in the past but is still very sharp. It has some nicks and scratches. The caseback has some scratches but is in good condition. The attractive dolphin on the case back is still clearly visible as is the case serial number. The lume on the hands and hour markers matches in color and has developed a consistent patina. The crystal has been replaced with a 62MAS NOS crystal. The dial is flawless. The bezel has faded to a beautiful greyish tone. It is intact with some signs of wear. The crown is original and is signed “Seiko.” A complete servicing of the movement was completed by our watchmaker in April, 2020. It is currently running at 22 sec/day