Hello, I have a nice s&w and I’ve been researching but I was wondering if anybody knows more. I have a s&w mod. 31-1, serial no. H109654, it’s got a pinned barrel, 2 piece hammer (pinned firing pin) and a goldish medallion in the grip, and a square butt. The most I’ve been able to find out is that it’s a 1965 regulation police, but I’m not sure because I can’t find it in the blue book of guns. Does anybody have any more info?