It looks like a reproduction of the 1849 Pocket Revolver. Uberti still shows it on their web site. But the 1849 Pocket was a .31 caliber. The one your friend has is .36 caliber, which would make it a short-barreled version of an 1851 Navy. Possibly a "Storekeeper's Model"?
https://www.uberti-usa.com/black-pow...cket-revolvers
With a brass frame, it's a lower cost "reproduction" of a firearm that didn't exist, since Colt never made 1851s with brass frames. Back in the 1970s, that model probably sold for about $100 to $150. I suspect it's worth less today, in that condition. Although someone might be interested because of the short barrel.