Their most famous and important fruit jar in the early years was their “Kerr – Economy” jar, made in large quantities at their plants in Altoona, KS and Sand Springs, OK.
Many of the earlier ECONOMY types are marked with the words “KERR GLASS MFG.
For anyone learning more about the different Kerr jar types and their market values, I would encourage them to consult the value pricing guide used by most advanced fruit jar collectors: the so-called “RED BOOK” of fruit jars.
The Kerr glass plants were bought by Ball Corporation in 1992, (Ball later left the glass container business altogether, and sold the plants to Saint-Gobain Containers, now Verallia).
(See Ball Bros Glass Company, Anchor Hocking Glass Corporation, and Ball Perfect Mason).It also has a covered third finger hole to help with smaller hand reach.