Does anyone know what this is/was used for and what it is called?

Owner also said:

In case it is not obvious: The top is detachable and on the right side there is a really small opening. I’d say it is too small for oil.

Some of the people opinions on it:

Mark Zangs
Looks like a hooka pipe to me.

Emily Fink Bauman
For those who like Ether

Connie Miley Jones
Too bad I can’t see the entire image. What I DO see looks like an oil or vinegar decanter

Werk Reno
Opium pipe?

Ralph Haurin
Bring it over and I’ll show ya

Anthony Gervais
An early 20th century bong?

David Fischer
It is use for drinking wine. We got one in Barcelona Spain. You but the wine in it and pour it from the tip of the cone right in your mouth. The fun part is to see how big of a stream you can make between your mouth and the bottle. It is called a “poron”.

Tyler Anne Stillabower
David Fischer oh yeah! I think you’re right

Mark Boe
Water pipe aka bong