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[Seth Hawkins]

 

[Fox Creek Kid]

Who ever did it is good, but IMO not Colt style good. It may very well be another "mystery conversion" IMO. Notice on the left side of the gun where the conversion ring meets the frame at the bottom. That made me suspicious. I think it's a gunsmith's work.

[Hoof Hearted]

I clicked on the link Seth so graciously supplied and there are more pics (and the auction) showing that it is "of the style" but not a true Richards-Mason conversion........

[Major 2]

1862 Army San Marco prototype 
for the 1870 Shot Show