If that watch isn't personal to you, I wouldn't bother spending money to service it. If however it means something to you because it came from your Dad and you want to wear it, what
@Mac5 said.
I have my Dad's 1961 Tissot Seastar that he wore for over 50 years. I don't feel the need to wear it, but I certainly don't want to part with it either and so it lives unserviced in a drawer with various other bits of his, to be looked at maybe once a year.
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