Vintage Polly Gasoline Sign. This vintage porcelain sign features Polly the parrot. The sign measures 12 1/2″ by 10 1/4″ and has a colorful design with excellent porcelain. It is a great piece of gas and oil advertising memorabilia for collectors, retro man cave decor or your shop or garage. Vintage Gasoline porcelain sign. Polly Premium Motor Oil. 12 1/2″ by 10 1/4″. Vibrant colors and excellent porcelain.