According to Disney license plate collector, Steve Garner, these bicycle plates tend to be pretty rare today and are hardly ever seen on ebay. When they do show, most are in very poor, rusted condition.
Plate images courtesy of the Lou Smith Collection via Steve Garner.
For the 1967 theatrical re-release of Snow White and the Seven Dwarfs, this plate was displayed (along with the other five in the set) on page 10 of the merchandise supplement that accompanied the film's promotional pressbook. It's believed that these were the first "license plates" to ever be sold by Disney.