I would say that the price at which it is being offered is quite high, for it's condition & for what it likely is.
You can get automatic Omega Seamasters (and similar models), not just gold-plated, but gold-capped (so, higher intrinsic value even just accounting for value of the gold itself) for anywhere from about US$250 to about US$350 around here where I am. The price range depends upon specific model & condition (some are re-dialed, some have the earlier generations of bumper automatic movements,...). But of about the same generation of yours with a cal. 56x family movement ... I wouldn't pay the 360 some Euros (never even 360 Dollars
) for that one you show.
Omegas are not so rare that you can't do a lot better for your money!