Blue line-drawing illustration of two women with bob haircuts smelling flowers. Blue text above each woman. Blue scalloped border around edge of button.
Until about 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, more unusual and inventive mirrors can frequently be sold at auction for hundreds of dollars to collectors. This art deco illustration is part of a more risque category of pocket mirror that create a different view of a woman's legs when inverted.
Simpson, Milt. (1994) Folk Erotica. Harper Collins. p. 54.