Hi. New to forum and to Patek watches, as I’ve always been more interested in Rolex and sport watches. I picked up a vintage Patek which I think is a circa 1950’s Calatrava, and judging from the coin edge bezel, I suspect it’s a reference 570. When my local jewelder friend popped the case back off, I expected to find it stamped with the reference number but can’t see anything hat looks like a reference, just a six digit serial number and other markings. I’ve attached photos of the mechanism as well as case back. Any help in identifying this particular model would be a great help! Thanks. Charlie
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