looks awesome! great watch!
as others have said, don't change anything visible except maybe the crystal, but do get the movement serviced by someone with 321 experience and access to parts. if you Polish the crystal instead, be sure the bezel is taken off before you do - or at least tape it up, but taking it off would be better. Replacing it (keep the original in the bureau along with that stretch bracelet!) won't diminish the value.
I do kinda dig the bund though.
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