Watch looks fine to me, crown isn't the period correct one (but that often the case and no problem). Case was a bit polished, but nothing too bad. I wouldn't trust a seller if he states that the watch was serviced if he can't provide any documents supporting that claim. Bracelet is to new for the watch (it's probably from a seamaster cosmic), a proper one would be a BOR Bracelet or a leather strap. For 500$, why not. If he can't provide any proof of service, I would use it to try reduce the price a bit.
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