This is a rectangular Sinclair Opaline Motor Oils porcelain sign. This particular Sinclair Opaline Motor Oils sign is predominantly green and white. It reads, “Authorized Dealer, Sinclair Opaline Motor Oil, Seals Power At Every Degree of Wear, Sinclair Opaline Motor Oil” and features a green and white striped can of Sinclair Opaline Motor Oil on the right side of the sign.
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