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~1700 Brass French Gunnery Sector by Michael Butterfield, Paris. Michael Butterfield, an English clock maker was born in 1635 and worked in Paris ~1680-1724. One source has Butterfield as a British clockmaker who settled in Paris about the year 1685 where he became engineer to the King. The British National Maritime Museum has him working in Paris ca. 1675- 1715. The sector is of the French design in good condition. Other very similar Butterfield sectors are held by the Metropolitan Museum of Art, the British Museum, and the National Museum of Scotland.