Thank you for sharing your knowledge on this gun with me and I am now going to absolutely get the letter from S&W. I left the gun at the gunsmith to have the heavy spring replaced with a lighter gauge as i was finding i tended to shoot high with the heavy trigger pull and after firing it, decided if i lessened the pull, i might be a bit more accurate (and I would have a rather fashionable carry piece!)...I will check the screws and other identifying marks when i get it back.
My dad served in Korea until 1952 and with 4 digit sn/, i would like to think he got this when he got back...in any event, you've answered the important questions and i truly appreciate it.
take care and thanks again~Barbara