Vintage Sinclair porcelain sign features the iconic Sinclair dinosaur in the center and is made of durable porcelain. And boasts vibrant red and green colors that will catch the eye of any collector or admirer. 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. Bright colors w/ porcelain on both sides.