a “Diamond and O (oval) entwined, with an I in center” and dates from circa 1929 into the mid and late 1950s. (Latest confirmed date code with this older trademark known on a bottle is 1966).
Typically, the number on the LEFT of the diamond logo is the plant code number, the number on the RIGHT is a year date code, and the number below the logo (if present) indicates the mold number (mold identifying number, “mold cavity number” or serial number). Examples: plant code #2 stood for the Huntington, WV plant; “3″ was the Fairmont, WV plant(number used up to 1981, later “3” was used by Muskogee, OK); “4” was Clarksburg, WV; “7″ indicated Alton, IL; “9″, the Streator, IL factory; “12″ was Gas City, IN; “14″ was the Bridgeton, NJ plant, #21 is Portland, OR; #22 is Tracy, CA; #20 is Oakland, CA; #23 is Los Angeles, CA, etc.
neat bottle , most of those smaller bottlers its pretty hard to find much on the company by now , sometimes there might be local history books which mention such bottlers but often pretty hard to research
I don't see the owens Illinois glass mark much here and when I do its always on American bottles