I own a 51 Navy with Address Saml Colt New York City on the barrel with no proof marks visible and a nickeled or silver grip frame. I sent this shooter to have the cylinder pin, arbor?, fixed to a gunsmith who did a cracker jack job, but lost one of the frame/barrel pins. While trying to find a new pin on line I was advised that the gun was made by Armi San Marcos, and I would have to make a pin because the company folded some years ago. This info came from the parts company that is all initials that I can't remember.
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