Willliam-Penn-sign

William Penn Motor Oils (“100% Pure Pennsylvania Oil”) double-sided porcelain sign, 24 inches in diameter (est. $5,000-$7,000). (Photo courtesy Matthews Auctions)

William Penn Motor Oils (“100% Pure Pennsylvania Oil”) double-sided porcelain sign, 24 inches in diameter (est. $5,000-$7,000). (Photo courtesy Matthews Auctions)

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