[3] The clock, designed by Audichron founder John L. Franklin, is driven by a 1.25-horsepower (0.93 kW) Janett motor.

[4] Originally located on a Mount Washington hillside,[5] the clock's face was used as advertising for a succession of beverages, including Coca-Cola, and Fort Pitt,[6] Ballantine, Carling, and Schlitz beers.

In 1961, the Duquesne Brewing Company bought the clock, painted its "Have A Duke" slogan on the face and installed it atop its building in the South Side where it has been running since.

The Pittsburgh Brewing Company paid $44,000 to repair the clock when it took over in 1999, paying $5,000 a month to show its logo on the face.

In October 2009, AT&T took over the rights to advertise on the clock and redesigned the face to display the traditional blue and white AT&T logo.