Exceptional Swiss gold three bridge chronometer Circa 1883

Exceptional and rare gold three bridge hunting cased chronometer watch, neuchatel observatory
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An exceptional and rare Swiss pink gold three bridge hunting cased chronometer watch, neuchatel observatory,  first class bulletin, circa 1883,,elaborately damascened nickel movement with patented three  bridge, counter poised lever escapement, barrel stamped ‘Girard Perregaux Chaux de Fonds’, cut bimetallic balance, precision regulator,‘Spiral Breguet à Renversement’.

White enamel dial, Roman numerals, subsidiary seconds, engine-turned case stamped JFN (Jean Frédéric Nardin) engraved with an escutcheon below a crown, flanked by foliate decoration, two cuvettes inner glazed and outer gold engraved Bulletin de Première Classe à l’Observatoire Cantonal de Neufchatel, case, dial and movement signed.
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Diameter 83 mm
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Signed: Girard-Perregaux
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Constant Girard (1825-1903) founder of Girard Perregaux was the technician behind the legendary gold triple bridge plate construction, which was made with tourbillon and/or precision lever escapements. He produced a handful of such pieces between 1865 and 1890. The present example with lever escapement is possibly among the earliest known.