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Instruments · Completed 1759

Harrison's H4 marine timekeeper

London

Pocket Watches · Commissioned 1783; completed 1827

Breguet No. 160 'Marie Antoinette'

Paris

Clocks · 1410

Prague Astronomical Clock (Orloj)

Old Town Hall, Prague

Clocks · c. 1088–1092

Su Song's Astronomical Clock Tower

Kaifeng