single-sided c. 1930's american industrial die cut steel "high voltage" green and white porcelain enameled steel sign possibly fabricated by the stonehouse steel sign co., denver, co. the nicely worn and weathered long and narrow sign contains pre-drilled holes in each of the corners for mounting purposes. most of the wear is found along the edges. measures approximately 13 3/4 x 4 3/4 inches.