Very cool I make some of my own tools nothing like that thought
Material wise is it std hex stock or is it some tool steel....?
I like the offset and could definitely see a use in a smaller size maybe 8 and 12 lbs
My lastest creation is a stubby sledge hammer I rehandled by removing the damaged section I used what was left. thus shortening it from 32” down to 18” with a 12lbs head I now have a “Thor” hammer but when you need a lot of force in a small area it’s a kick to break out something custom. The plan is to make a 24” 10lbs, to round out the set of 5 sledge hammers 8-16lbs 18”-36” but I see something truly custom after seeing this.
I don’t know exactly how it done, but each tooth on a “old fashioned” saw has bend a little outward to create a Kerf Angle most saws have teeth and rakers the teeth do the cutting the rakers do the cleaning I’m and not positive if they are both angled might depend on the saw itself.. The Angle of each tooth outward from center dictates the with of the cut compared to the spine or back of the blade. The kerf angle is very important in keeping the saw cutting straight and keeping the blade from binding as to little a kerf angle and the blade it self will not fit into the cut. It can effect other aspects but that’s about where my knowledge ends...
On hand saws my guess is it done with smaller hammer or a type of pliers.
I’d guess what you have was for service at a log mill or large lumber yard or maybe even a blade manufacturer.
Regardless it’s like very cool...