Salesman sample milk bottle ...............

Pictured here is another example of a salesman sample milk bottle featuring the bottle dimensions / mold number on one side & possible color combinations on the other side. This bottle is from OWENS ILLINOIS GLASS COMPANY.
Possible color combinations included 1) 21 BLACK on 12 RED-ORANGE 2) 16 GREEN on 11 YELLOW 3) 18 RED on 11 YELLOW 4) 21 BLACK on 18 RED.
These style bottles are rarely offered for sale.