Established in 1946, O-SO started as an independent soft drink company based in Chicago, IL. By the end of the decade the company had a network of bottlers in nearly every metropolitan market in the country. Originally famous for its O-SO grape flavor, the company added many new flavors and incorporated the lines "O-SO Good" and "O-SO Delicious" into its sales and marketing materials. O-SO grape is the original well rounded flavor that made them famous. Produced at our plant in Mukilteo, WA. 12 - 12 oz glass bottle sodas.