Original vintage porcelain enamel advertising sign for. Viking – A Perfect Unsweetened Milk. Featuring bold blue text on a white background, this rare dairy advertisement measures 14 x 10 inches. (maker’s mark visible), this sign is a desirable piece of British enamel advertising history. Perfect for collectors of vintage dairy, food, and beverage memorabilia. Maker: Wills & Co. Type: Porcelain enamel advertising sign. 14 x 10 inches. Colors: Blue text on white enamel background. Material: Porcelain enamel on heavy metal. Era: Early-mid 20th century dairy advertising. Subject: Food & beverage / Milk advertising. Mounting: Pre-drilled holes for hanging/display.