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This nave clock, which hangs in the outer southern side aisle, belongs to a clockwork mechanism on the first floor of the south tower that also controls the ringing of the cathedral bells (the hour is rung every quarter of an hour). In 1876, Johann Mannhardt of Munich was commissioned to make the mechanism, which went into operation in the cathedral in 1880. The face of the clock was destroyed in the Second World War. Following comprehensive restoration in 198889, it was returned to its original location in the south side aisle.