WOW! It could be it! I really think I see Bizon.. and maybe now the word above it says "Mexico by" even though it looks like "mexico do".. crazy. So this could be a custom knife by Fred Bizon. Very interesting!! Thank you so much! Is there any where to read about Fred Bizon?
There really isn't much on him, except that he was an American ex-pat that lived in one of the border towns in Mexico. Most know of his work because he had a contract with Abercrombie and Fitch during the 60's. He also made some fighting knives during the Korean and Vietnam conflicts. Active years seem to to be 50's - 70's.