Really nice piece you got there. Parker Edwards is one name I haven't heard in an awfully long time. Though I can't quite answer your question, I do however recall browsing through a late 1980's Blade(? or was it SOF can't be sure) magazine article about an 'extream test' done on a full sized Parker Edwards bowie as a step-ladder. You have to imagine that test like these were not commonplace "advertisement" for knife strength back then. It would be sometime before it became vogue, thank's to Cold Steel. Hope this helps.