I’ve inherited my grandfather’s Omega Seamaster, early 60s I think (photo attached). It’s keeping pretty good time, but I’d still like to get it serviced, however, that appears to be a minefield. I don’t plan to sell it, I want to wear it as a dress watch, but don’t want to destroy its value either. Is it okay to get the case polished? What parts should I try to keep original? Internals seem like fair game to keep it running well, but the face, hands and crown all look good to me, and would seem wrong to change? The crystal’s quite scratched, can that be replaced/repaired without devaluing it too much? And any recommendations for who would be good to undertake this work? (I live in London, but could send anywhere). Any help or thoughts massively appreciated. Really don’t want to wade into a vintage servicing mistake! Thanks in advance.