Very nice find thats a rare gun looks great restored to.
My rarest gun and a keeper(gona leave it original)is a DA 1878 in 45 Boxer (shoots 455 fiochhi) whats rare about it is its the early fat grip DA 1878 model which has compleat diffrent (and better) internals for locking up the cylinder.
This gun has the british barrel address and retailed by alfred cook gunsmith and retailer england, british proofmarks on each chamber.
I have a factory colt letter with it to.
gun is all original they ordered it with wood grips.
only the first 5000 made DA 1878s were fat grips with the better lock up system (i think it was more costly more machineing so colt changed it after about 5000 to the later 1878 lock up which i have found not as good)
has a minty bore tight lock up i love shooting this gun the bisley and this DA 1878 are the two strongest made pre 1898 handguns when all original . The DA 1878 has and edge over the bisley as the cylinders have no stop notch cut outs makeing them very strong guns hard to blow up, also frame is all one piece.
I have seen them in 41 LC to but there rare. ive never seen a fat grip in 41 Lc tho , mind you ive only seen a few fat grips in any caliber.
Shot it the other day shoots 6 inchs right over bullseye at 20 yds and under 3 inch groups.