Buttons: Campaign, Political, etc.
The first photographic image on pins dates to 1860. Abraham Lincoln and his various opponents used the tintype or ferrotype photo process. The first mass production of metal buttons dates to the 1896 William McKinley campaign for president with "celluloid" buttons with one side of a metal disk covered with paper (printed with the message) and protected by a layer of clear plastic.
Since 1916, buttons have also been produced by lithographing the image directly onto the metal disk. A celluloid-type button is fastened to a garment using a pin on the back side of the button (in recently produced buttons, the pin generally fits into a safety-pin-style catch). A lithographed button may fasten with a pinback or with a metal tab which folds over a lapel or pocket.