Wish you could see the proof marks if any. Lower grade gun in very worn condition but strange enough to be interesting. Keyed for end makes me think that the patent date is just about right, 1870-1875.
Looks like a lifter action in reverse. Push down button to open action with a fairly decent spring to help hold closed by keeping action button in the up position. Need to add it or one like it to my action collection. Doubt that there were very many made as the design was quickly dropped. Wonder if Charles Daly bought the patent and had a Belgian firm make it for them? I have seen this several times on other guns that they sold.
