An authentic vintage Japanese double-sided enamel advertising sign promoting Goshin Brand (五進印) aluminum cookware. The sign features a bold navy blue background with a large white aluminum cooking pot illustration highlighted by the bright red 五進印 logo. Additional text includes 「アルミ釜なら」 (“For aluminum cooking pots”), 「品質保証」 (“Quality Guaranteed”), and 「特約販売店」 (“Authorized Dealer”). The classic GKK logo appears in the upper left corner, completing this striking example of Showa-era Japanese commercial design. Both sides display the same original design, making it an excellent display piece for collectors of vintage advertising, kitchenware memorabilia, or industrial décor. The enamel surface retains attractive gloss and vivid colors. Age-related wear, including scratches, enamel chips, edge wear, oxidation, and rust around the mounting holes, is consistent with decades of use and enhances the sign’s authentic vintage appeal. Please examine all photographs carefully, as they form part of the description. Estimated production period: 1960s–1970s Dimensions * Width: approx. 46 cm * Height: approx. 30 cm Material * Enamel on steel Keywords Goshin, GKK, Aluminum, Cookware, Pot, Kitchen, Enamel, Sign, Advertising, Vintage, Japanese, Retro, Showa, Industrial, Collectible, Steel