MM,
I checked my recently built Hatchet. I did use the Sig 3/4x1. Pictured is the profile. I also checked my kit built VooDoo and that also has a 3/4x1 leading edge. I also noticed the 1x1 looked a bit pointy as well. As we have learned over the years blunt is better.
FYI- that's 3/4" deep x 1" height
Hope this helps and hope you make the vintage combat day!
best,
Tom