Hey everyone! I am considering buying this De Ville (from the 1970s?) and was hoping to get a second opinion on its authenticity. The movement, a calibre 630, looks rights from the photos, but what gives me pause is two factors: 1. I cant seem to find any others like it and 2. The dial says "De Ville" but the back case looks like it has the Seamaster logo on it. The dial doesnt look repainted or retouched to me (the seller claims it is not) and the crown is signed, but of course I am an absolute rookie. I would really appreciate some advice. Thank you!