Sinclair Opaline Motor Oil Original Porcelain Sign 60. Sign has chips scratches rust. The item "Sinclair Opaline Motor Oil Original Porcelain Sign 60" is in sale since Monday, December 14, 2020. This item is in the category "Collectibles\Advertising\Gas & Oil\Merchandise & Memorabilia\Signs".The seller is "tk27" and is located in Mechanicsburg, Pennsylvania. This item can be shipped to United States.