Wow Gord...good search!!.. Yes it does bear some real similarities
Interesting though-IF-one of the straps on mine bears a 1919 stamp (very faint and who knows if its not left over webbing used in a new way), and ARchibald's idea was a 1919 patent, then there seems to be a tad of time conflict especially since the one I have appears like a "MkIII" version, with the style, pads, hooks etc....
This is the closest yet to what it might be however, but golly there must be a definitive answer out there..photo even?
I will try to post better photos. Meanwhile thanks again gord!