Validation stickers on license plates are ubiquitous today, and have been ubiquitous in most states for more than 40 years. Surprisingly, ancillary means of revalidation have existed for nearly as long as license plates themselves.
The distant ancestor of the validation sticker was the metallic tax disc, usually fastened to the wooden dashboard of a car.
Other states also issued metallic dashboard discs in this era, but used them in conjunction with annual dated plates.
In 1916, the state of California issued a porcelain-enamel baseplate.
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For many years, Delaware issued stickers in colors for expiration months that stayed similar from year to year.