You want a carbon steel butcher knife. Ontario knife company still makes them and their
7" Hop Knife is a very good knife, inexpensive, will patina, and can be kept sharp. You will need to make a sheath....
https://ontario-knife-store.com/ontario-2-7-hop-knife-5060/
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OR you can spend a say around $30-$40 dollars and get one with the smaller pins in the knife handle, and an antique, and you can find them places like eBay. Just search under "antique butcher knife", and you will find some. Here's an example..., note the pins in the handle...
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These would've been the knives the average joe from the Virginia Long Hunters of 1760-1770 all the way up through the Civil War would've carried....not a custom combat knife.
If you want a double bladed knife, you might want to look at the
Ontario Knife Pig Sticker...
https://ontario-knife-store.com/ontario-old-hickory-73-6-sticker-knife-7155tc/ Most of the folks that I know that carries these leave them plain and use them as boot knives OR they remove the handle, modify the tang to accept a finger guard, and put on more antique looking wooden handles..
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LD