First of all, it's a caplock, not a flintlock. Beyond that, exact identification may be impossible. It doesn't look antique to me, though I could be wrong; more like perhaps a Spanish-made muzzleloader from the 1960s-'70s, maybe even built from a kit. Are there any visible markings anywhere on it?
Aftaid I'm not going to be much help in identifing that pistol. My guess though it's something on the low end of the scale since it's lacking a buttcap and barrel bands, which most of the military and sporting arms had. Appears to be cut for a rear sight which is missing.
JUKAR was a very very low end supplier. Some people said it should be pronounced "Junker". Some of their stuff was OK. they made locks for CVA in the 1970s-80s.
I would guess that the pistol you have sold originally NEW in the box for about $45.
In the condition of yours(very poor), I'd say $25 would be fair. It is a nice project gun. You or another could clean it up, get a sight, recontour the stock and refinish with some "brass furniture". then it would be a nice looking wall hanger, that would shoot. This gun was never accurate, and I suspect the market was mostly for reenactments and as an introduction to black powder.
Unfortunately, they originally went for maybe $50 -- strictly mass-produced, inexpensive BP pistols. Sometimes they can be refurbished in to solid fun shooters, if the bore is in any kind of shape at all, but in that condition I could find one almost any Saturday morning in a yard sale around here for no more than perhaps $10. If you have any interest in muzzleloaders, a bit of cleaning-and-fixing-up could net you a lot more in fun than it will ever give you in dollars.
Correct on low end quality early Jukar. Later Jukar improved barrel and IIRC were forunners of CVA and used the 2 piece breech with the Drum and Nipple as as "crossbolt". The one piece breech is the key. Forgive an old man stories but one of these launched nipple into range roof after it sheared hammer. I would leave it as decorator.
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