Vintage Rat Fink Porcelain Thermometer sign. This vintage Rat Fink thermometer is a must-have for any collector of gas and motor oil memorabilia. Made of durable porcelain, it features the iconic Ed Big Daddy Roth Rat and is perfect for displaying in a garage or man cave. Measuring at 4 3/4 by 7 1/2 inches, it is a great size for display. With its bright colors and classic design this sign is sure to catch the eye of anyone who appreciates Hot Rod advertising. Discover More About the Porcelain Signs Available in Our Other Auctions, Which Include a lot of Gasoline brands, Harley Davidson, Smith & Wesson and Other Items. 4 3/4 inches by 7 1/2 inches. Vibrant colors and excellent porcelain.