Originally Posted by opoefc

Welcome to the Forum. Assuming it's a .32, what's the serial number? That would be your first clue as to what model it is. It's not a 4th model, as the cylinder is the style of the 1st, 2nd & 3rd models. It's not a 1st model as the side plate is incorrect style for a 1st model, so it is probably a 2nd or 3rd model. 2nd model serial numbers run 31 - 22172 and 3rd models run 22173 to 43405 approx. Small parts differ in all the models, so repairs can be iffy and frustrating. You will need to get a parts diagram and schematic from a parts dealer, or the original S&W parts catalog to identify correct parts, and even then something like a cylinder stop part can be different in each model, and parts suppliers are not that knowledgable as too which gun a part may fit. Now you know why your buddy for it cheap ! Ed. Good Luck.