In the 18th century, they used what was available. And what was available was butcher knives. :wink: (and folding knives... WAY "underrepresented" today because decent 18th century type folders are hard to come by.) Took me a long time to really accept this conclusion, but I had to be honest with myself! :haha:
So many modern "bushcrafters" want to transport themselves to the 18th century, taking all their gear, techniques, and mindsets with them. It doesn't work that way. They will look at a thin scalper knife and think it's just way too thin and light and there's no way an outdoorsman could ever use such a thing... of course, to so many today, a knife is something that is used like a froe, and pounded with a mallet. A strange trend I still do not comprehend. :idunno:
Also remember that there was no "survival market" then. Today, one can shop for woodscrafting knives or any number of other survival gadgets and gizmos and find everything from the ridiculous to the sublime, relatively inexpensive, and delivered right to your doorstep. Not so 200+ years ago. People who ran around in the woods were considered NUTS. Reprobates and savages. And such a small number that no manufacturer was going to bother catering to them. Besides, if butcher knives were good enough for the Indians, they would be good enough for everyone. This seemed to change during the 19th century as the nation began to take pride in the "rugged outdoorsman", and by the end of that century, camping/hunting/outdoor knives of all kinds were readily available.
As far as custom made/blacksmith made knives in the 18th century... well, I'm not convinced it was common at all. Neither am I convinced that they were non-existant. I have yet to see an 18th century blacksmith record book showing that he made a knife for anyone. Hinges, horseshoes, hasps, but no knives. I would love to see if there are any records of this.
There are some recovered knives/blades that are of the spike tang variety, perhaps of heavier construction than the common butcher knives, and apparently imported and sold unhafted, with the new owner affixing the blade into a wood or antler crown handle (simply stabbed into a hole and perhaps affixed with cutler cement?)
If one wants a somewhat nicer grade of belt knife, there are recorded instances of people using a "case knife with the end ground to a point". I have seen photos of one or two original examples of these. A case knife is a table knife, sold with a matching fork. Very common, imported from England. Much nicer looking than a scalper! Usually with forged bolsters, bone or antler handle scales, etc. Just take that big rounded end and reshape it into a decent point, and voila'! You have a hunting knife. I'd like to come up with something like this for myself, but time and energy is pretty well tapped out. Maybe eventually.