I would keep looking in europe that is wear nealy all the left over spencers ended up before the army started to sell serpless ones in the US,alot of the early serpless was bought by big companys who promperly sold them to France,your carbine would have been in the left over sporting rifles that were not sold and bought by the American Repeating Rifle Co who were then bought out by Winchester with a large stock of unsold modle 1867s NM &sporting rifles, Winchester pushed hard to sell these rifles to various european goverments,and were triled by Switzaland,England that i know of probly other contrys as well Japan bought some and France the magirity of the rest,i think some of the machinery ended up in Belgian were it was yoused to make the Falisse&Trappman Spencer ,though i carnt find evedance for this,i was told this was a front for winchester so they could try the spencer market,but i am inclined to think this is a product of too much speclation