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I don't know a lot about Zoli guns, have handled a few, they seem solid but unspectacular. In excellent shape that gun would sell for just under $1000 i'd expect. In the condition it's in, I'd expect something closer to $600 or so.
With the damaged rib, pitting on the barrels, nicks in the wood, it's more like the $450.00 range. It is not a high price gun, high quality gun. It would be a $650.00 gun with no issues.