Abstract: An illuminated, box-type telephone sign having an integral display box supported by a rigid member at only one end of the box. The support member is in the form of a rectangular trough made of resin formed by a cold casting process. The display box have five sides and an open end that fits over and is secured to edges of the supporting member. Support for electrical lamps such as concentric fluorescent bulbs and other electrical components is provided by a bracket connected to the support member and without any connection to the display box. A U-shaped sleeve that slides over front, back, and end faces of the box is also disclosed. The structure avoids the use of a peripheral metal frame for the box and braces connected to such frame, thus providing easier installation and more ready access for maintenance. The lack of a peripheral frame also makes additional faces of the sign available for graphics.