Smith & Wesson K frame .22 lr complete cylinder assembly for the model 17, 18, or 48 revolvers (will not fit a 53). According to the serial number (294158) stamped on underside of the extractor, it was made in the very late 1950's. It does not have a number on the cylinder itself. It remains in approximately 95% or better original condition, with a turn ring and only a few other tiny marks. The ejector rod contains most of the original finish. I have a crane that goes with it that is not in as good shape as the cylinder. I bought these to ad a .22lr cylinder to my model 48-4, they do not work with that gun, but should would fine with an older 48 or 17/18. $150 shipped Jim