Illustration of woman wearing a hat resting her head in her hands.
Through the 1940s, pocket mirrors were a popular advertising opportunity, given that the back of the mirror would be on display whenever the user pulled it out in public to check their reflection. Today, unusual and inventive mirrors can frequently be sold at auction for hundreds of dollars to collectors.
This artistic illustration is part of a more risque category of pocket mirror, metamorphic, that creates a different image when held upside down. The primary view is a girl in a hat with hair down resting her head in her hands, while the inverted view is a woman's legs and intimate areas.
Simpson, Milt. (1994) Folk Erotica. Harper Collins. p. 54.