1948 Signal Oil
From what I know, this card was given out in Oakland, Calif., at area Signal Gasoline stations. The set consists of 24 cards of Oakland Oaks players — including Charles "Casey" Stengel.
Gassaway played in parts of three major league seasons with the Chicago Cubs, Philadelphia Athletics and Cleveland Indians. He went 5-9 with a 4.04 ERA in the three years.
One interesting thing about this card is that it is very thin, not much thicker than a business card.
It's a cool regional card from the old Pacific Coast League.