Swiss 18K gold detent chronometer deck watch Circa 1875

Gold deck chronometer with helical hairspring
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An important and heavy deck chronometer pocket watch made by Patek Philippe in Geneva, Switzerland, circa 1875. This watch features an 18 carat gold open faced case with a raised monogram on the back lid and numbered cuvette. The white enamel dial features Roman hours, an outer minute track, outermost Arabic five minute numerals, a subsidiary seconds dial at 6 o’clock and blued steel spade hands. The exquisite, rare quality movement is fitted with a spring detent chronometer escapement, helical hairspring, golden wheels, wolf’s toothing, a large chronometer balance with gold screws and moustache lever.
The dial and cuvette are signed.
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Diameter: 53 mm
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Weight: 135 g
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Signed: Patek Philippe & Co Genève
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Patek Philippe made only a few chronometers with this deck caliber, some with lever escapement and some with spring detent escapement. This special edition with gold wheels and helical hairspring was probably made for the English market.