I would say powder horn - I guess a whiskey nip bottle shaped to resemble metal powder horns of the 19th century of the same shape. I do not recall ever seeing one of these.
If you search for glass powder horns you will see many, none of which look like this - and you might think I have no idea what the heck I am talking about. Instead, look for metal powder horns - here is a link: https://www.google.com/search?q=19th+c+metal+powder+horn&tbm=isch&ved=2ahUKEwjnqrSgit31AhUhsHIEHd7QDG8Q2-cCegQIABAA&oq=19th+c+metal+powder+horn&gs_lcp=CgNpbWcQAzoECAAQGDoFCAAQgAQ6CAgAELEDEIMBOggIABCABBCxAzoLCAAQgAQQsQMQgwE6BAgAEEM6BAgAEB5QqRFY9zZgxzhoAHAAeACAAVeIAYQNkgECMjWYAQCgAQGqAQtnd3Mtd2l6LWltZ8ABAQ&sclient=img&ei=NGj4YefAJqHgytMP3qGz-AY&bih=1068&biw=1523&client=firefox-b-1-d
and you will see what I am referring to.