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Impossible to value a weapon with just the caliber and serial number to any degree of accuracy.
1200
No published sn data.
10-100 usd
50-150
such black powder revolvers are anywhere from $150 - $250, depending on condition
10-100 usd
50-450 usd
depends on overall condition
No published sn data.
41 or 42 ? about 350 $
Call Colt and they will tell you. Proofhouse.com has Colt sn data.