Vehicle registration plates of the United States for 1906
In 1906 Pennsylvania and Virginia joined the list of those providing license plates to vehicle owners, and the prestate era began in Washington (state). There were now 10 states that were issuing license plates and 17 other states requiring owners to provide their own license plates. Passenger baseplates. In the table below, a light green background indicates that the owner of the vehicle was required to provide their own license plates. These plates are called "prestate" by most collectors. In the prestate era many states only provided the license plate number  on a small disc or on paper, and the owner was required to have their license plate(s) made. These early license plates were created from kits that could be purchased at a hardware store, may have been available from automobile clubs or associations, they were forged by blacksmiths or other tradesmen, or the owner may have made their own plate with whatever materials they had on hand. Prestate plates were made from a variety of materials, but most often were made of leather, steel, or wood.