In my never ending quest to keep the economy afloat, I've started a "collection" of Police Positive Specials in .38 Spl. The 3 I currently have are: (1) 2nd Issue (1936) and (2) 3rd issues, B554xx (4" 1972)& 8214xx (6" 1963). The 1972 model came with Black Pachmar grips and the 1963 with checkered walnut. My quandry is that the butt frame on the '72 with the Pachmars is square on the bottom and 1/2" shorter than the '63 which has a rounded bottom. Were the Pachmar grips standard and the frame just made shorter in this version? How about the rounded butt on the '63. Are most 3rd Issues rounded or is this a variation?