Why bother with this gun? Do you need a wall hanger? It is a gun made before 1875 or so, that does not need to be shot anymore. Look at your left hand and try to tell me that the loss of it is worth shooting this old klunker one more time. It is either a Belgian made gun or most likely one of the many minor English makers from the later 1860's to 1870's time frame. Keyed fore ends were a thing of the past by 1880. Those hammers were a hold over form an earlier era or were made in the early 1870 period at the latest. To me that gun screams not to be shot. Maybe worth owning just to have a very early double example, but not as a shooter.