MilDiver
845
Regrets, I've had a few
Purchased new, PAM195, never serviced, still kicking 20 years..
Longines, chrono, 1980, got it from the original owner, it has never been serviced. nearly 45 years w/o service. ..
Tissot,18k manual wind, early 60's, in the family since new, never serviced.
WW2 airplane instrument watch, never serviced.

WW2