Just bought a very nice Colt Police Positive Special serial # 475197. The serial numder as you can see has six digits. I researched this number on the internet and found a site that matches serial number to year of production which is 1941. My question. The serial number on mine which is on the crane and on the frame where the crane rest is 475197 with a lightly struct M underneath the number. The research site does show serial numbers with a M as part of the number but they are all 5 digit numbers made in the mid 1970's. Am I correct in saying mine is a 1941? Thanks for the help. Ed