I second CanadianBottles that it's apothecary. Late 1800s. Is the inside of the neck ground? Can you tell having tumbled it? These often came with a ground neck and a glass stopper. And yes, they seem to have been pontiled much past when most other products were no longer being...
Believe they sold liquor of various sorts in a few different containers. My mom had a cobalt cylinder with the same embossing only horizontal on the shoulder. Traded it for a good ink many years ago. It was a great window bottle that we dug locally back in the 70s.
The iron pontil is a dead giveaway that it's the real Mccoy. I know of no repro with an iron pontil.
Don't know what it's worth but it's not a common one and you sure as heck are going to recoup your dollar.
Any chance for an old civil war encampment? I don't think the pinfire cartridge weapons were common much after the civil war. Once center fire and rimfire cartridges hit the market everything else fell by the wayside pretty quickly.