Yellowstone National Park porcelain license plate topper is a must-have for any collector of gas and oil memorabilia. 10 1/2″ x 5 3/4″. Porcelain topper features a bold green and brown color with the iconic Tepee graphic, making it a great addition to any collection. Whether you are displaying this sign as part of your collection in your man cave, shop, bar, or garage, or giving it as a gift, you can also browse my other auctions for more vintage gas, oil, aviation, automobile, motorcycle, and hunting signs. Vintage porcelain License Plate Topper. Bright colors w/ porcelain on both sides.