I have one similar, however, it has the round knob on the end of the extractor rod, and the back of the front sight blade has a slight radius to it. Serial is 318XXX, but it is not in such fine condition as this one. In addition, when I got it, it had a set of butt ugly home made target grips on it. Mine does not say regulation police, just Smith&Wesson on the right side of the barrel, and 32 Long Ctg on the left side.