What kind of glass bottle is this?

[Unitedstatesofamerica1]

 

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[villagenut]

A ring necked slick medicine, probably from 1890 period. Would have had a paper label and could be utilized by about anyone who wanted to fill it with their concoction and put their own label on it.

 

[jgas]

Flavoring extract. My guess. jgas

 

[linnea810]

Flavoring extract or medicine, can't tell for sure without labelling or embossing