authentic c. 1940's american vintage industrial medium-sized "porcelain-silveray" pressed heavy gauge steel exterior sign letter removed from an old standard oil service station shuttered long ago. the brightly colored cobalt blue porcelain enameled building facade letter sign was likely fabricated by the federal electric company, chicago, il. the deeply embossed and beveled edge single letter remains in great overall condition, considering age. the single-sided exterior letter mounts flush against the wall. measures 18 1/2 x 12 inches.