Duquesne Brewery Clock

Located on the Duquesne Brewing Company building in Pittsburgh, Pennsylvania, the Duquesne Brewery Clock was the largest single-face clock in the world when it was installed in 1933. Over the years its face has been used to advertise numerous brands, beginning with Coca-Cola. As it stands now, it is the largest clock in North America, and the seventh largest in the world.

Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).