I was searching how to date bottles and thats what came up on a website for trying to date by narrowing the date by the lips. I did think it was an Illinois Glass company so thank you for confirming that for me.
I have a number of bottles that I have collected just because i love the colors. However I am interested in dating them I have both old bell jars and other bottles. The one i am interested in at the moment has IG Co L on the bottom and has either a flask lip or a brandy lip, not sure which one...