Pre model one? Prototype, Zach, 1st fighter, I can live with any of 'em. Back to the fingergrips, have you (or anyone, for that matter) ever seen a fighter with a 3 finger grip? I guess it's important to me because I think the Zacharias knives, (ordered by the Lt. himself)
are the only ones ever made in that configuration, that physically demonstrates the designers' original intentions. One of those features (the relief in the spine, directly forward of the hilt) is still found on today's fighters. Maybe I see it as a "DNA marker" for the bloodline.

Added text... Reading Gaddis is a must, I noticed mention of an owners initials being marked in the butt of a pre-war carving knife that Bo gifted to someone. It's the only place in print I know of mentioning initials marked in the butt of a grip before the pics of the two known Zachs showed up.