original american industrial c. 1940's single-sided brightly colored stamped and/or pressed enameled steel "do not use this machine without a guard" cautionary sign salvaged from an old st. louis meat processing complex/factory undergoing demolition. the polychrome enameled steel signs remain in great shape considering age. the sign was fabricated by the parker metal decorators co., baltimore, md. surface wear evident. measures 6 1/2 by 9 1/2 inches. two available. priced individually.