Sadly... The title of World's Largest 4-faced clock no longer belongs here. The Abraj Al Bait in Saudi apparently holds this title.World's Largest 4-Faced Clock
Rockwell International's four-faced clock is the world's largest in Milwaukee, Wisconsin, and to some is known as the "Polish moon" because of its location, which was primarily Polish and at night the lit up faces resembles the moon.World's Largest Four-Faced Clock
The Rockwell Automation facility in South Milwaukee is home to the World's Largest Four-Faced Clock. It is probably more well known as the Allen Bradley clock tower, which was purchased by Rockwell Automation then Rockwell International in 1985.
The clock tower was turned on (the faces also illuminate) October 31st 1962. Each face is 40-ft 3.5-inches wide. The minute hands are 20-ft. long and 22-inches wide at the base. The hour hands are 16-ft. long and the hour markings are 4-ft. long and 3 ft wide at the base.