Reddog,
Tell me more about the serial number. Are you getting it off the butt of the piece? Also, does it appear on the underside of the barrel, and the back of the cylinder? It should. If the serial number does not have a "K" prefix, or "S" that is unusual. When you bought it in the 60's, you said it was used, could it be that it is much older?? Please describe the ejector rod - is it straight up to the end, or does it have a "knob" on it? I am thinking you might have an earlier piece, possible pre-war? What does the front sight look like? How about the grips? Are they numbered to the gun? Hmmmm, what else? Is there any patent information on the top of the barrel?, and what does it say? Let's see if we can determine what you have. ......SmithNut