62MAS

The small crown is the identifying feature of this reference

6217-8000 carries a noticeably smaller crown than the 6217-8001 that replaced it. Because the case numbers differ by one digit and the watches are otherwise close, a large-crown watch offered as a -8000 is either mis-described or has had its crown replaced with the later part. Read the case number off the caseback and confirm the crown matches it; do not accept either on its own.

A serial outside 1965 contradicts this reference

The documented production window is short enough that the caseback serial is an unusually strong cross-check here. A year digit admitting only decades other than 1965 should be resolved before anything else about the watch is assessed — see the serial-dating tool for how the candidate decades are eliminated.