Souvenir state plates date back to the 1870s. When travel became more accessible thanks to cars, they became increasingly popular with jet-setting travelers. There are tons of unsigned, flea-market-type plates out there, but keep your eyes open for some big-name manufacturers, including Vernon Kilns, Homer Laughlin, Salem China Company, and even Wedgwood.

You can find some state plates online at My Granny’s Attic Antiques.