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Wrigley's Trolley Signs

c. 1910's through 1930's (estimated). These trolley signs were early advertisements for Wrigley's. I think they appeared on municipal trolleys, hence the name. Trolley signs are smaller and more artistically interesting than are the bus signs that appeared later in the 1940's through 1960's.

What you see above is an assortment of signs, but it's by no means an exhaustive collection.