Wraco, I have a 5" M&P with the late pattern hammer and the half-moon front sight. I figured it for mid-50's or an earlier gun with a replacement hammer. However, when I had it lettered it was shipped in December 1950. I have since seen or heard of two more guns, and now yours, with that same sight/hammer combination. Apparently they began using the late-pattern hammer on K-frames much earlier than I had originally thought.
I'm at work and don't remember my gun's s/n, but I will check and see how close it is to yours. I'm going to guess your gun at about 1951 or so.
Nice one!
Snuffy
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