I just purchased a 15-3 off the forum that has a bull barrel installed. It looks like a good start on a PPC gun. It does appear to be stainless steel, the lettering is crisp, it is not nickel. It has case colored trigger and hammer, and a blued extractor star. Most all of it's collector value is gone due to the modifications that were done in an irreversable way. It is stamped 15-3, ser. # 13K51XX. The stampings you would expect on the stainless model are not there. I've been told that the gun is from 1967, and it would not be old enough to be one of the twenty built in stainless. Assuming I'm correct about it being stainless, is there any explanation for this gun. I can not imagine they would stamp 15-3 on a model 67, and back date the serial number. Is there anything I'm missing here?