I had been looking at this 1905 for well over a year now at a local pawn shop. After picking up the dog from the beauty parlor Saturday I stopped by to see if they still had it and it was still there. I fully intended for it to leave with me but they also had a really nice near NIB C prefix and an excellent condition S prefix. That really fouled things up, couldn't make up my mind so I told them I would think about them over the weekend and try to come to a decision. They said they would be open half a day New Years eve if I wanted to come and look again and so I did. Ended up leaving with all three. All numbers match on all 3 with the exception of the 1905's grips(stocks) which are unnumbered. The 1905 5646XX I think is 1926-27 era, the S8555XX late '46 early '47 and the C1802XX I'm going to guess as a '49-51 model(as far as ship dates go). Please correct me if I'm wrong.
1905 4th 5646XX
S Prefix S8555XX
C Prefix 1802XX