I'll see what I can find.
Not certain how many I've made over the years, but only a few fit within the muzzleloading hobby parameters. However, I've spent considerable time looking at extant examples...
Top - Friction folder with a beavertail stop and horn handle
Middle - Farrier's rasp, maple ball-grip handle stained with
Aquafortis reagent, 3 steel pins, tapered half-tang
Bottom - Farrier's rasp, maple ball-grip handle stained with
Aquafortis reagent, 2 steel pins, tapered half-tang
The blades were shaped using a coal forge, ground to rough shape with a bench grinder, the profile and bevels refined with files, quenched in oil and tempered in the oven.