Is the narrow end hollow?
How about an ice scraper/garden edger with a long handle in line with the blade?
Looks like the knob on the narrow end was clamped or mechanically fastened onto the blade as opposed to forged.
Ok I let it soak in my electrified tub over night and now I think the handle was riveted on.
It was at the same location where I found the 1906 Burnt Big Beautiful Barber Half Dollar.