[BASEBALL]. “World Series Ticket” Advertising Card for R. C. A. Radio Tubes. [Washington, D.C.: Washington Theatre Supply Co., ca. 1920s]. Advertising card in the form of a “Box Seat” ticket to listen to the World Series on the radio in one’s home. Approximately 60 x 151 mm. Toned, some marginal rubbing, creasing, upper right corner missing corner, lower right corner creased. Some text on front: “Washington, Oct. 9 / Section Parlor or Sitting Room / Row Just Behind Ma and Pa / This Entitles the Holder to One Box Seat At or Near Your Radio Set in Your Own Home Where You Can Tune in Hear The Play by Play Results of the World’s Series Baseball Games…”