IMO, its Loy's scroll work that helps identifies his work. I think Flues did some engraving. I briefly had the chance to purchase his last gun, a .410 double that he was working on just prior to his death. His grand nephew, with whom Emil was living said it was engraved by him (Emil). It was in some respects a bit crude but all done by Flues who was quite elderly at the time. The family decided to keep it. I have extensive photos of it and I think I put one in my Ithaca book.