I have never seen one for sale either. When Bill contacted me that he had these made from the remaining parts of the Eureka run Derek and I were very happy. Only 13, 2 bladed ones with wooden handles, not the old Cattaraugus Rosewood and 1 single blade. But the one that I was most happy to get was a 2 bladed knife with the old Catt Rosewood handles.
Below is a picture of 3 knives, The single bladed one is the only one made and the 2 blade deep laser engraved JBF is the only one with the old Catt handles. The knife deep laser engraved GALVANIC was from the first run and is what I call a sterile knife. There is no serial number on it. GEC sometimes etches these prototype but they are not really just overruns.
I would buy any and all JBF Champlin knives back that I can find.