
bottleinfo.historicbottles.com
From 1954
Owens-Illinois Glass Company
Upright I enclosed by an oval, with the diamond removed. This Pepsi bottle illustrates the later logo, alongside separate customer, date and mould codes.
Read the stamp
Bottle marks can identify the glass manufacturer, mould, capacity or production date; these numbers and emblems have separate roles.
On many Owens-Illinois bottles, a maker device sits between a plant code at the left and a date code at the right. Other glasshouses use different arrangements. A large embossed number alone can identify a mould rather than a year.
Record the full base, heel and closure. A patent or design date belongs to the design history, while a maker-specific code can identify manufacture. Read the logo before applying a particular date system.