there are enough ph markings on there to convince me that it was worked on by parker hale especially with the soldered on front ramp saying parker hale. I have looked over quite a few of these over the years and I do not believe all had a ph stamp on the barrel. The only ones I have seen marked parker hale on the barrel for sure are the custom 1 and custom 4,I think this is because the customs were re barreled by ph, the others like supreme and deluxe had the original barrel cut, re blued/polished and a front ramp added, either with screws or solder, I don't believe the supreme or deluxe models nessesarily have PH markings.