YC;
I have an I Hollis & Sons percussion muzzle loader which when I was young I hunted with quite a bit. Always enjoyed it & it was quite dependable. New pinfire shotguns were still being listed in the 1911 Alfa (German) catalog, don't know just when the last one may have been made. As Tinker said Isaac Hollis was an English maker & my ML'r bears Birminghsm proof marks as your pinfire likely does as well. My ML'r carries a combined proof mark in which the bbls were proofed only once with the definitive proof load. As best as I can determine this was not an option prior to 1887, fairly late for a ML'r, so Hollis may have produced guns which were technically obsolete upon order. If you can post all the proof marks (pictures preferable) they should give some clue as to it's build date.
