sorry, I can't help either, at least not in any precise way, but........if Ivo will forgive the butting in, I would just add to his comments already given.........
The 'fortification' or ring around the neck below the rim of the mouth, appears quite accurate in shape for a period bottle i.e. late C17 - early C18. Apparently, they were made this way such that when in position the cork was tied on with string - obviously using this ring as an anchor for the string. However, looking at the few pics. I have of genuine period bottles - they appear opaque......dark green, brown, or possibly blue - and were referred to generally as onion bottles or seal bottles, and would probably have been taller than this one. Does this example have wear in the sort of places you'd expect i.e around the waist - slight chipping etc. around the mouth. Does the source of the bottle (no pun intended) suggest an antique origin. Having said all that, and bearing in mind the size, I might suggest a tourist piece or a retro item for use as a cruet of some kind for oil or vinegar, but definitely C20, and probably continental. :ooh: