Sinclair Porcelain Rare 14 Foot 2 Piece Sign. The item "Sinclair Porcelain Rare 14 Foot 2 Piece Sign" is in sale since Wednesday, October 30, 2019. This item is in the category "Collectibles\Advertising\Gas & Oil\Merchandise & Memorabilia\Signs". The seller is "boesstore" and is located in Twin Bridges, Montana. This item can be shipped to United States.