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Thanks.A photo of the 4th screw. Serial number K 287136. Not model marked.
I've got a Combat Masterpiece in the K296000 range that also has the flatter hammer profile which first appeared on the Combat Magnums in '56. I've seen both 4" and 6" K-38s, as well as M&Ps with various barrel lengths from that time frame with both styles of hammers.Mine has the later flat spur on the hammer. Yours shows that the earlier style spur was still being used up as late as 1956. It isn't unheard of.
It's the access point for the cylinder stop spring and plunger.The screw in front of the trigger guard, what does it do?