Mr. Gladstone's speech was an expansion of his postcard, punctuated by cheers.
The Big Bow Mystery|I. Zangwill
But neither mother nor daughter had offered to show her postcard to the other.
Good Old Anna|Marie Belloc Lowndes
Did you receive that postcard in due course or about the cancellation date appearing on the face of the card?
Warren Commission (1 of 26): Hearings Vol. I (of 15)|The President's Commission on the Assassination of President Kennedy
Only I suppose you are put out because you haven't had a postcard from Birdie Lee!
The Moving Picture Boys at Panama|Victor Appleton
There was a postcard from friends in Camberley, saying that our defence has at last been understood, and asking what one wanted.
The Secrets of a Kuttite|Edward O. Mousley
British Dictionary definitions for postcard
postcard
/ (ˈpəʊstˌkɑːd) /
noun
a card, often bearing a photograph, picture, etc, on one side, (picture postcard), for sending a message by post without an envelopeAlso called (US): postal card