Vintage White Castle Porcelain Sign. This vintage White Castle porcelain sign is a great display of American fast-food history. Measuring 12″ x 5″ and made of porcelain on both sides, it features the graphics of advertising for the iconic fast-food chain. Whether you’re a fan of White Castle or just love vintage advertising, this sign is a must-have for any collector or enthusiast. Graphic of the White Castle 5 cent Hamburger. Vibrant colors and excellent porcelain.