Perfect Circle Oil Hog Piston Rings tin sign. Don't drive an oil hog! This is the rarer of the two yellow versions.I also have the second version available for sale. The item "Perfect Circle Embossed Piston Rings Tin Sign, Oil Hog, Original, not porcelain" is in sale since Thursday, June 14, 2018. This item is in the category "Collectibles\Advertising\Gas & Oil\Merchandise & Memorabilia\Signs". The seller is "70hemibird" and is located in Elbert, Colorado. This item can be shipped to United States.