from looking at the reciever it looks like a new england arms, a very old one. im not sure what it is worth if it is in fact a n.e.f the new ones go anywhere from 100$ to 250$ but yours looks older so it could be worth more or less because of age. also the condition, i hope i was at least a tiny bit helpful.
Location: Third bunker on the right,Central Virginia
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Similar to the H&R singles, but not enuff detail in the pix (ran out of pixels enlarging them). If you can post better pics, and any markings on the gun (including marks UNDER the wood of the forearm) we would have a better chance of getting you a realistic answer. There were many of these made in Spain and Italy over the years.