Throw-out Card-Earll Muddiman-Pennsylvania-King Optical Illusion

ITEM: Throw-out Card-Earll Muddiman-Pennsylvania-King Optical Illusion
FRONT IMAGE: All text with explanation of the Joker Illusion on the back. This is followed by his name, address, phone, and Copyright 1957.
BACK IMAGE: Drawing of a playing card king riding a bicycle. JOKER printed down left edge.
DATE: 1957
SIZE: 2 1/2 by 3 1/2 inches, round corners.
COND: In otherwise Very Fine, almost Mint Condition.