An unusual bottle for certain - thanks for posting. Not particularly old, maybe 1960s-ish. If it were clear and did not have the knobs on the neck then I might say something like vinegar or household product use.
I have a hunch those knobs were somehow used to either:
secure the closure in a secondary way (as in, dangerous contents, do not open by accident)perhaps some type of attached pouring spout or connection to something else (lab use?) (embalming fluid, attach to tubing?)
I doubt there is much value since it is so new but it is a curiosity. Do let us know if you find out anything more.
