Interesting bottle, I am not familiar with it. The embossed donkey is most unusual.
A late 19th c. mold blown bottle like this is unlikely to be unique. Undoubtedly, at least one batch were blown.
If you are looking for value, you will get a bunch of opinions. My approach would be to consider the range of prices paid for small, later 19th c. smooth base aqua medicine bottles, esp. from southern states. That at least gives you a range or bracket.