Swiss 18 Carat rose gold pocket lever chronometer Circa 1860

Gold open faced with an olive shaped pendant
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A large and heavy Swiss, 18 Carat rose gold pocket lever chronometer with fusee and helical balance spring, circa 1860. A polished case with master mark JG, the back engraved with a foliate monogram, olive shaped pendant. Hinged gold cuvette engraved César Jolly, Argenteuil, 1866.  White enamel dial by Droz, radial Roman numerals, outer minute track, subsidiary seconds and blued steel Breguet hands.
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A matte gilt, half plate movement, fusee and chain, maintaining power on the fusee, 12 jewels, counterpoised and calibrated straight line lever escapement, cut bimetallic compensation balance with gold temperature and meantime adjustment screws, blued steel helical balance spring with inner and outer terminal curves, index regulator, winding with female arbour. Dial and movement signed, dial signed on the counter enamel by Droz.
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Diameter: 58 mm
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Signed: Auguste Louis Berthoud  Swiss
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Auguste Louis Berthoud was Born in 1828 in the Rue de Richelieu where his father Louis Simon Henri had his workshop and shop. A chronometer maker in the family tradition, Auguste Louis’s chronometers were heavily influenced by the work of his grandfather Louis Berthoud. He was the author of a great number of articles concerning the history of horology and in particular some remarkable biographical notes of the great clockmakers published between 1900 and 1905 in the review l’Horloger. Auguste Louis Berthoud died in 1910 at Ivry-sur-Seine.