Standard Oil Iso Vis Porcelain Sign. The item "Standard Oil Iso Vis Porcelain Sign" is in sale since Friday, March 5, 2021. This item is in the category "Collectibles\Advertising\Gas & Oil\Merchandise & Memorabilia\Signs". The seller is "daninjackson" and is located in Beech Bluff, Tennessee. This item can be shipped to United States.