Swiss two day marine deck chronometer original key Circa 1993

Marine chronometer 
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A fine two day marine chronometer, accompanied by the original key. Made in a limited number to commemorate the 300^th anniversary of the birth of John Harrison (1693-1776) by Girard Perregaux, La Chaux de Fonds Switzerland, circa 1993. Three tier wooden box, the middle section with applied plaque, the lower section with flush handles in the sides, gimballed weighted steel bowl and screw down bezel.
Matte black dial with white painted Arabic numerals, outer minute track with luminous five minute indexes, subsidiary seconds and power reserve, luminous steel epee hands, red seconds and power reserve hands. Gilt movement with striped decoration, cylindrical pillars secured by screws, a separate bridge for the spring barrel, applied plaque inscribed ‘JH No.5’, fusee and chain with Harrison’s maintaining power, Earnshaw’s spring footed detent escapement with jewelled locking stone, jewelled to the center, free sprung Guillaume integral balance with four cylindrical weights and helical balance spring.
Dial, case and movement signed.
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Dimensions: 19 cm square
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Signed: John Harrison
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Girard Perregaux SA is a luxury Swiss watch manufacturer with its origins dating back to 1791. In 2022, the management of Girard Perregaux completed a management buyout from the French luxury group Kering. Headquartered in La Chaux de Fonds, Switzerland, the company opened the Girard Perregaux Museum near its headquarters in Villa Marguerite in 1999. It is best known for the historic Tourbillon with three gold bridges, which was awarded a gold medal at the 1889 International Exposition in Paris soon after the launch of the watch. Other notable models from the company include the collection 1966, Vintage 1945 and models such as Tri-Axial Tourbillon and Laureato, an icon inspired by the 70’s.
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Detent escapement
First detent escapement by Pierre Le Roy 1748. Earnshaw’s detent escapement is used widely in chronometers. The detent or chronometer escapement is considered the most accurate of the balance wheel escapements and was used in marine chronometers, although some precision watches during the 18^th and 19^th centuries also used it.