I have the same rifle Pedersoli Kentucky 50cal. Bought mine second hand in new condition 3 years ago with both the Cap Lock and flint lock. Cost $650. Another sold about the same time for $700 Flint only. These were on Trademe
Yours looks to be an older version. The barrels are now blued and have wooden ramrods: $500 - $600 would be fair. Browned barrel ,it may have been a kit so perhaps worth a little less.
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