That is a nice job you did. I am including a few pictures of ones I have made. The new looking one I made for my father and he uses it as a patch knife.
The aged one is my personal knife that I routinely carry for everyday use, I added some incised lettering on that is supposed to look like something an early owner might have done around the campfire. This one started out as a regular knife, but the handle split while I was attaching the blade and rather than throw it away I stabilized the split and got creative with the finish.
The next is one of my standard cherry handle knives in process, I don't normally assemble the with unfinished handles, but this one was for a client who wanted to finish it to match his rifle.
Here is a picture of the handle being turned on the lathe. I primarly work on a metal lathe and this is what I use for these handles. The bolt is what I use as a tool rest for free forming the ball end.
The last is a finished one which was the first penny knife I built. I wouldn't try to make one crude looking, just because something was inexpensive in the 18th century doesn't mean it looked crude.