Shell Gasoline porcelain sign features the iconic Shell Premium Gasoline branding and is made of porcelain. The sign measures 12 across and features the clam shell and is designed for use on a Shell automobile pump. 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 Shell porcelain sign. 12 inches in diameter. Bright colors w/ porcelain on both sides.