I have a S&W that I bought at an estate sale a couple of years ago. It is nickel plate, on the side of the barrel it has "38 S&W Special Ctg," No model#, No S&W logo on the frame under the cylinder release, 4 screw sideplate and the serial # is on the butt of the frame. There is some rust and pitting but the first 3 #'s are 315. The strange thing is the 3 is smaller than the other #'s, but other than that does not look out of place (doesn't appear to be any overstrikes or any attempts to change the #'s).
Any info would be appreciated as the cylinder appears to be out of time and I would like to see about fixing it.