Spitball Army

Card is untitled on its front.

Printed on back of post card:

The most celebrated rarity among U.S. postal issues is the 24 cent air mail stamp with inverted center. Shown approximately four times actual size is one of the original sheet of 100 stamps purchased by a collector on May 14, 1918 at the Washington, D.C. post office.National Museum of History and Technology
Smithsonian Institution

53540-C

Publishing information:

A Mavis Pudding Picturecard.