Docwaters, Dennis Ellingsen, aka ibdennis, did an indepth study of the Black Beauty pattern not long ago for an article he was writing for publication. He would be most likely to know. I don't have his contact information, and don't remember what publication his article was written for, very possible the Oregon Knife Collector's Newsletter. If I remember correctly, the Black Beauty production did not span a long period of time, relatively speaking.
Codger