Postcards, "pop-ups", and mechanical Valentines, circa 1900-1930 
Buster Brown Valentine postcard by Richard Felton Outcault, early years of 20th century
Postcard by Nister, circa 1906
Valentine postcard, circa 1900-1910
"Pop-ups" create a three-dimensional effect when opened, circa 1900
A tiny 2-inch pop-up Valentine, circa 1920
Football-playing Disney-like rat and bulldog are set in motion by the pull-tab on the right, circa 1920
A grommet affixed to the center of the card permits the dog's eyes to glance side-to-side when the blue bow is moved
Rocking horse and rider, circa 1920-1930
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