About 14” long & 3” high, found it cleaning my basement. Top above the cutting edge is really mushroomed over like you would use it like a froe, the handle is comfortable in the hand, no wear in the hole.
I'd expect some failure at the thin edge if it'd been bent. It's certainly been been banged on a lot.
Possibly home-made. It looks like something to split or dress a convex edge, like a barrel stave or post. I've never seen any other similar curved splitting tool.
Yes, it tapers on both sides, both long flat grinds, and on the concave side it has an additional grind to bring it to a blades edge, about as sharp as your worst lawn mower blade.
Could certinly be wrong, but my guess is that it's an old tiller blade for laying garden rows. I can remember one of the men in my lfe having one much like it. It attached with a single bolt to the lower part of the tiller. The poor one bolt design allowed for it to work loose and wobble after use and it would have to be periodically retightened. I think them cursing it is why I remember it so well. You can see one like it in the upper photo near the top. The curve is probably from much wear and hitting large rocks or roots.
