Thanks Bill. My gun went to S&W employee Dave Baker. When I called Camfour and told them I'd pay them to look it up for me, they didn't want to. I'd give them the month & year and all they would have to do is check they're log book for that era. Not sure if they had to sign guns out in 1964. I'm surprised the even ser. no. that mine is was made into a model 28. Larry