Round trigger gard, very sharp cylinder scene and all proof marks very good. Serial number 15000 and all parts matching . This is a 3rd model dragoon made in 1856 from my research
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The presented object appears to be a Colt 3rd Model Dragoon percussion revolver. It has all parts matching serial number 15000 and was probably made regarding this serial number in the year 1856. It should have a 44 caliber and the top of the barrel is marked "Address Saml Colt New-York".
This piece is in good condition and there are no serious damages visible.
An auction estimation would be between 4.000 to 7.000 USD.
This estimation is based on actual recent past recorded auction sales of comparables. Retail "asking prices" can be higher and vary.
With kind regards,