Great looking bottle for sure, my first guess would also be Benedictine or something similar. Also agree with age being around late nineteenth century.
beendiggin, I'm leaning towards late 19th century too. It has a lot of honest wear to the bottom. It also came out of an estate with a large 19th century bottle collection and I thought this was the nicest bottle there. I've been looking at the Benedictine bottles, but I can't find them with straight sides.