all original single-sided antique american industrial depression-era robust cold-rolled steel richly colored cobalt blue porcelain enameled die cut steel sign salvaged from an old factory cafeteria or lunch hall. the american industrial sign was likely manufactured by burdick or the veribrite sign company of chicago, ills. the porcelain enameled sign remains in excellent condition, considering age. the original metal grommets are pinched tightly against the four mounting holes. the factory sign measures 10 x 7 inches.