Many thanks for the responses. I have collected antique iron for 50+ years and have seen some obvious repos and undoubtedly purchased some. In the case of the Yellin tools, They looked great, were represented by a so called reputable dealer as real. When I offered them for sale, a buyer was dubious, so I spent a lot of time on research I should have done to start with. What convinced me that they were not authentic was the makers mark. It was hard to find a real mark on the web, but after a discussion with Yellin's granddaughter, who immediately said that from the photo I sent, the mark was not his. The authentic mark was his name as a continuous raised name to be stamped into the steel. What was on the tools I bought was the name stamped in one tool as individual letters and not spaced as might be expected. I was able to find some offerings, on the internet, sold at auction and verified by the granddaughter, that showed the mark as it should be. She also said that he marked each tool, not just one. The handles had some inlaid cooper, and he did not work with copper in such a way. Thus an expensive error.