The letter I in a diamond as your bottle shows was the mark used by Illinois Glass Company for the period of 1916 to 1929 according to Julian Toulouse's book on bottle marks. This company later became Owens-Illinois
It would be nice to include a photo of your entire bottle, someone may be able to tell you a bit more about the bottle itself.
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It would be nice to include a photo of your entire bottle, someone may be able to tell you a bit more about the bottle itself.