This antique sign features the Sinclair Opaline ‘F’ Motor Oil.” The sign is a white rectangle with a black border. The text on the sign reads “Made Expressly for FORD cars / to keep them silent / and smooth / Sinclair / Opaline ‘F’ Motor Oil.” The Sinclair logo appears in the lower right corner, and the phrase “Authorized Dealer” is printed at the bottom of the rectangular sign.
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