Dear fellows, I been wondering for a long time about one Omega my father inherit from his father. On a quick look, you can tell it's a Seamaster from 50s or more like 60s. Quite similar to some of the De Ville that came later. I want to have it replaced to the original strap (leather?, mesh?) the actual being alternative. Also want to replace the crystal (which was badly replaced last time). Not being certain about the model/year I cannot ask for the correct spares. Hope someone can help me!!! Regards, Pablo Omega/Panerai/Tissot/Hamilton/etc