Sinclair Gasoline porcelain sign features a striking design with bold green colors and is made of porcelain material. It is perfect for display in a garage, shop, or man cave. The sign measures 11 3/4 and is in excellent condition, with no major chips or cracks. It was made in the United States and has excellent porcelain and colors. 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 Sinclair porcelain sign. Sinclair Gasoline, old motorcycle and pinup girl. 11 3/4 inches in diameter. Bright colors w/ porcelain on both sides.