Yet, pins in one form or another have been around almost since the beginning when the Disney Company started selling merchandise to fund their animated film projects.
Left: Vintage Mickey Mouse Pin. Made by Cohn and Rosenberger from 1933-1936. Measures approximately 1" tall, pinback clasp. Stamped "© WD" on back.
Here's a couple of early Snow White pins...
Brier Manufacturing Company circa 1938. "©WD" stamped on back.
This Snow White broach clasp pin is made from plastic and was sold at theatres during the first general release of the film. The Dwarfs are gathered around playing musical instruments. Pin came attached to a white card with non-Disney drawings of Snow White and Dwarfs in the woods. Top of card reads "SNOW WHITE PRODUCTS." 1937-38.