Parkhurst 12-gauge, pretty sure it's a cheapo trade gun. Yeah, whoever chopped and polished it ruined the antique value, but there really wasn't any to begin with.
Unfortunately the barrels are Belgian laminated steel, may a tad stronger than Damascus, but still, built for black powder. I'll run low brass birdshot and 20-gauge with adapters. If it's not obvious, there are a couple of 1-3/4" "hater tots" in there, not afraid to shoot those either.
Interestingly, the common wisdom is to never fire modern loads, pressure too high. I'll never find the video again, but a couple of old white guys tested this with 6 or 8 crappy Damascus barrels, no issue. They both had some sort of materials/engineering background and laid out why these old barrels won't explode. Thoughts? FUD?
Only thing I don't like is the loose hammers. If both are cocked, they'll almost always both go off. That's not normal is it? Only other 100+ year-old shotgun I have is a Remington 1894 with internal hammers, works flawlessly. I've tightened the screws on the sides, but the wear on the firing pins tells me the insides have to be worn. Any advice? Thought about taking the hammers off and maybe putting a washer in there?
Bring it to a legit gunsmith and let them do a full rundown/rework on it. They'll make sure it's safe to fire and get it properly working. Do not try and do this on your own. A proper gunsmith will be able to check for microcracks and any delamination of the metals. You don't want a break action to blow up in your face.