If you could look on the bottom the pontil should tell you something. Is the pontil polished or cut and rough? It is a blown glass pot and my thought is that it could be a shipwreck bottle, it does appear to have been excavated. It is interesting in that it is fairly crudely made, the top is uneven and the glass looks fairly heavy, but the detail, that looks like a slice of a chevron cane, is lovely and I would expect to see that type of detail on a finer pot. Do you know the height? Is it small? The longer I look at it the more curious it becomes. Do you know what it is or are you hoping someone can tell you? I'm just giving my thoughts as I look at it I don't know what it is. Very interesting.