I came across this Colt DA 1917 45acp revolver. It has the barrel shortened to 3 3/8", modern front site added, bobbed hammer, new finish added, grip has been turned into a rounded grip with what appears to be Jerry Miculek grips. I noticed up in the left side of the gun an added mark that appears to be JM. Did Jerry Miculek do custom work? Any idea on value of this piece? DOB would be great as well S/N: 196xxx