original c. 1940's or early 1950's american vintage industrial reinforced heavy gauge steel city street construction zone cautionary sign designed and fabricated by the indestructible street sign co., columbus, oh. the single-sided brightly colored orange stamped metal sign contains the word "slow" in lightly raised or embossed lettering. the diamond-shaped sign contains two screw holes for mounting against a signpost. surface wear and discoloration evident. decommissioned from the city of chicago streets and sanitation department. 24 inches x 24 inches.