I'm no expert on S&W revolvers, but I do have the Standard Catalog of Smith and Wesson 4th Edition. I believe what you have is a .32 Regulation Police (postwar) Pre-Model 31. The G 45634 is not the model number, but rather an assembly number used by the factory is keeping revolver parts together after fitting and before the final polish and finish (blue in the case of yours). If there is the number 31 inside crane on the yoke, that would be the model number and useful in dating. The Catalog says the upper side plate screw (which yours does not have) was deleted in 1956 at serial number 640980. The factory began using the Model 31 stamp in 1957. So extrapolating (no upper sideplate screw and no "Model 31" stamp) , your revolver was probably shipped 1956-1957 although S&W sometimes shipped out of numerical sequence. Then again, I could be dead wrong, but the picture in the Catalog of the post war Regulation Police looks very much like your revolver. Value is listed at Good $450, Very Good $600. Yours has some surface scratches, so value is probably in between those two. Carefully remove the grips as the serial number may be printed or stamped on one side. The grips appear to be the appropriate style for your revolver. It's a very nice gun.