Marilyn Monroe, who was featured in the first issue, was the only one to appear as "Sweetheart of the Month". The first model called a Playmate of the Month was Margie Harrison, Miss January 1954, in the second issue of Playboy.
Generally a woman may appear only once as a Playmate, but in the early years of the magazine, some models were featured multiple times. Marilyn Waltz (February 1954, April 1954, April 1955 – her first appearance was as Margaret Scott) and Janet Pilgrim (July 1955, December 1955, and October 1956) are tied for the most appearances. Margie Harrison (January 1954, June 1954) and Marguerite Empey (May 1955, February 1956) are the only other women to appear more than once as Playmates.
Visit them at the Playboy Centerfold, this is a stunning collection of photographs.