Steel housing with clear powdercoat finish, poplar rear cover. Likely the only one of this style; the display was recovered from an old piece of test equipment, and no others have been found. The display has a neon lamp behind each numeral, and a multiplexed nixie clock circuit is used to drive them. The clock can display time in 12 or 24-hour mode, and has a blanking option to disable the display. An additional neon indicator below the matrix display flashes to indicate seconds. The clock runs on 9 VAC and uses two pushbuttons for setting and control.