the numbers are 4324C on the left 20 (and I think that is the Owens Illinois Bottle Company Logo with a 7 to the right of it, then to the right of the big SA (AS, SV, VS) is an 8. From what I can tell, if it is OI Bottle Co, then the 20 is indicative of either a plant in Brakinridge, PA between 1930 and 1940 or Oakland California 1936-present.... So, Literally... any time from 1930 to today. The think that is throwing me is the AS... or whatever that logo is.