View attachment 84307
Bill hook.
Most don’t have the back blade.
This is the tool we used for gathering small Christmas trees.
We used it for pea stick (First) thinning too.
Pretty much the same pattern as mine but without the hole, and probably twice as thick.
This is sort of my point. They all look a bit alike, but they're really not. Just see A Load of Old Billhooks to illustrate. Are we talking a particularly heavy pattern? Or light? Avoid two-handed? Or not? Or does it actually not matter at all (gasp!) and the dozens of different designs were "just because" all along? Which would be a valid answer, but I will admit, surprising.