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The tallest freestanding clock tower in the world is the Joseph Chamberlain Memorial Clock Tower (Old Joe) at the University of Birmingham in Birmingham, United Kingdom. The tower stands at tall and was completed in 1908. The clock tower of Philadelphia City Hall was part of the tallest building in the world from 1894, when the tower was topped out and the building partially occupied, until 1908.
Joseph Chamberlain Memorial Clock Tower (Old Joe)