Sieberling vintage enamel sign.
Dimensions: 120 x 50 c
 
The Seiberling Rubber Company was founded in 1921 in Barberton, Ohio. In only six years Seiberling rose from 330th to 7th place in the tire industry. During World War II, Seiberling supplied tires for heavy artillery pieces. Seiberling is also credited for inventing the Saw-Tooth Tread and the tire Heat-Vents.
Seiberling Tire's advertising in the 1940s through the 1950s was famous for the brand's slogan of "A name you can trust in Rubber."
The company was acquired in 1965 by the Firestone Tire and Rubber Company, ultimately belonging to Bridgestone when the latter took over Firestone. Seiberling tires are no longer sold in the US market, but the brand name is still in use in some countries. Manufactured at Firestone's plants, they are aimed to the budget-oriented consumer in selected sizes.
 
source: https://en.wikipedia.org/wiki/Seiberling_Rubber_Company (edited)