I got to spend an hour or so hunting my mystery house last night. I found the usual iron stuff (bolts, bars, railroad spikes)=, etc), so I was excited to see a brass signal show up. It surprised me how small the piece of brass was, given how strong the signal was. I didn't think to measure, but if it were intact, it would be maybe a bit more than half the size of a dime. But half of it is missing. After cleaning it off, I found that it's the primer end of a paper cartridge. From what I could learn, paper cartridges fell out of use by 1870, which would make this the oldest thing I've found there so far. Unfortunately I don't see any marks or stamps that might tell more about it, so what you see is all there is. It's small potatoes compared to lots of finds here, but it made my day.
Outside and inside views:

Outside and inside views:
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