Remarkable English 14K rose gold chronometer Circa 1815

Rose gold chronometer by Sigismund Rentzsch
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A remarkable English 14 carat rose gold open faced pocket chronometer, circa 1815. Full plate movement according to Thomas Earnshaw, spring detent escapement, chain and fusee, sugar-tongs temperature compensation for blued balance spring. Gilt dial with applied Arabic hours, outer minute dots, engine-turned centre and subsidiary seconds. Engine-turned case. Cuvette and movement signed and numbered.
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Diameter: 54 mm
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Weight: 153 g
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Signed: Sd Rentzsch Queen Street Golden Square London
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Sigismund Rentzsch had a workshop at St. James Square and was appointed maker to the royal court. He was also one of the most renowned members of the London Clockmakers’ Company. In 1813 he obtained a patent for a much-admired automatic chronometer (that is a keyless watch). Rentzsch was born in 1776 near Strehla on the river Elbe in Germany. He moved to England between 1804 and 1811, where he became an English citizen on May 18th, 1811. Rentzsch trained watchmakers such as Giles Coates, who later worked for Benjamin Louis Vulliamy. Pierre Frédéric Ingold also worked for Rentzsch. He died in 1843.