Astronomical clock, St. Nicholas Church, Stralsund

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The astronomical clock of St. Nicholas Church, Stralsund is a 14th century monumental astrolabe clock. It was probably damaged in the 16th century, and has not worked since then. It is the only clock of its kind to have been preserved almost entirely in its original condition. The clockwork and the indications have not been restored.^[1][2]

The Stralsund clock is the oldest mechanical clock in the world to have been preserved in its original state, and one of the oldest fittings in St. Nicholas, first mentioned in 1394. It is positioned in the church's choir, directly behind the high altar. The clock features a self-portrait of its maker Nikolaus Lilienfeld, which is considered to be the oldest portrait of a clockmaker in the German-speaking world.