Thanks for all the input. I will return the hammer to the customer when I replace it for him. If he ever wishes to sell it he will have it. I've asked about what dept. he worked for. I'll update later. Will any K frame hammer work? I have found listed mod 10, mod 10-15-19, and K frame. I have worked on many S&W since my days at Colorado School of Trades in 1976. I had a long time with Numrich Arms also. Just never thought much about the variations of parts within a frame size.

One more question. The mod 36-1 hammer is the hardest to find of the mans collection. Any place come to mind on who might have one?