Curtis is correct. Take a good look at the R-63. It should be a digit instead of an R. Something like 8.63, which would be August 1863. ahowever if it's an R, it just means the stamper picked up the wrong stamp, it should be a digit. As he said the R N stands for refinish/Repair and Nickel. the stamps on the right grip frame are fitters/assemblers/inspectors stamps.