I have s & w model 681 stamped NYSP mod 681-m serial AAK0xxx inside on the left side grip B1 15398 S all in one line. On the right grip I have a capital R in a circle and numbers 7541 and then a mark looks like a mountain. Can anyone help me out, dates ext. I know a State Trooper carried it and I have the original holster and cartridge carrier.