The Nineteen-cent Prexie
Airmail special delivery postcard
From January 1, 1949 to August 1, 1958 the airmail postcard rate was four cents. The special delivery rate was fifteen cents from January 1, 1949 to January 1, 1952, making the airmail special delivery postcard rate nineteen cents over that period.
The message on this card is about holding medicine until arrival, making it a reasonable use of the services.