This is an exceedingly rare Colt pistol. In all my years of dealing in antique firearms, this is the first Colt  Baby Dragoon  conversion  I've ever seen.  Bruce McDowell's  " A Study of Colt Conversion and other Percussion Revolvers "  is lacking any examples .  It's serial # 6208 would indicate it was mfg.'d in 1848 . All the serial numbers  match and the action is very good with a strong main spring. A really great find ! 

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