original c. 1940's new old stock vintage american industrial factory machine shop high voltage cautionary or warning signs. comprised of heavy gauge steel, the single-sided factory signs were fabricated (but never used) by the ready made sign co., new york city, ny. the original baked enameled finish remains in great overall condition, considering age. each heavy gauge steel sign contains four screws holes for mounting purposes. measure 10 x 7 inches. priced individually.