Welcome to the forum.
Nice find. A decanter would be far more refined than this, that is far more precisely manufactured and probably in clear glass.
Your bottle was probably made for a food product of some kind. Collectors know this by the many similar shaped examples, some of which have survived with labels. I am guessing yours is about 8" tall or so. As for age, it would be later 19th century. It is most likely American, but I will hold out at least some possibility that it may be of British manufacture.
This is a particularly attractive example with all of its hand blown irregularity. Collectors really like that.
