I am new to this forum so please bear with me. I have recently decided to purchase a 1960 patek philippe 3445. I was looking to try to get one that had a more interesting dial than the common gold or silver dial with gold Batton markers. I do not want to wear it everyday but hope to keep it for a few years. I was looking for a yellow gold watch with patina to indicate that it has not been polished. I found one that I like but there is something that bothers me. When I inspect the screw-down back on some examples I see 2 or 3 stamped halmarks or assay markings on the external surface. On others I see no external markings on the Screw-back. Is this sign that the watch has been polished or did Patek make some watches with marks on the external surface of the screwback and others without? All watches appear to have a hallmark on the main watch case under one of the lugs. I would really appreciate some guidance before I go and purchase a duffer!
Thanks in anticipation!!