My best guess is this from the Clevenger Bros. Glass Works in Clayton, New Jersey sometime after 1966. The company did a lot of mold blown reproductions (would explain the seam), and started putting a "CB" mark on their glass in '66. So, maybe is this is a reproduction of an earlier design, done by that company. https://www.glassbottlemarks.com/bottlemarks-2/ http://clevenger.sjerseyglass.com/ Edit: by the way, rosemary oil is indeed one of those things that people like to use as a natural remedy. A right cure-all, if the exceedingly reliable internet is to be believed...
Pfft. Right or wrong, all I really care about is the discussions that evolve from these things. I mean, this thread is only six comments deep and you, me, and kleinbl00 have touched on folk medicine, glass making, gems, and swindling. That's a pretty eclectic mix for such a small number of comments.
True indeed. That website, by the way, has a big section on glass insulators. I went back to the antique threads linked at the bottom and you mentioned that you liked such things. Maybe you can ID the ones you have.