What does the mark on the heel of a soda bottle mean?

[brynnc]

Thank you!!

 

[brynnc]

Thank you!!

 

[ROBBYBOBBY64]

Is there anywhere you know if that I could find any info on these companies? Thanks for your help!

Search old advertisements online from Chicago.
ROBBYBOBBY64.

 

[K6TIM]

Search old advertisements online from Chicago.
ROBBYBOBBY64.

The mark on the bottom of your bottles is usually a logo of the glass company who made the model,and a stamp number for the form used a month number ll like #9 (september),and maybe a date like 47 meaning 1947 not all the time though!