Hi Eric,
Thanks for the email. I received a reply from Mr. Schmitz explaining that he did not make the knife. It would have been fun, after all these years, to find out that he had. But the knife is a favorite of mine no matter who the maker was. An original is pictured in Grant's book, The Knife in Homespun America, on page 160 (PK-23).
Regards,
Pletch