Gas & Oil Advertising. Sinclair Gasoline Dino Rectangle Porcelain Sign. This Sinclair Gasoline sign has a clean white field with a green outlined panel holding a red “Sinclair” script and the famous green dinosaur, with “Gasoline” in red below. Sinclair Oil was founded by Harry F. Sinclair in 1916 and adopted the dinosaur as its mascot in 1930, using it to point to the vast age of petroleum. Hang it in your garage, shop, or man cave, and it’ll set the tone every time you walk in. It’s a great pick for Sinclair and dino collectors and anyone who loves old service station style. Size: 12″ wide by 13″ high. Please see photos for details. Wrapped and boxed for a safe trip. Most orders go out within 24 hours. Hundreds more signs in our store. Please look over the photos closely, as they show the exact sign you’ll receive. For gas and oil, automotive, aviation, soda, and general store signs. Send us a message anytime. We’re always happy to talk signs! Bob’s Garage Signs. Thanks for stopping by the garage.