Swiss technical interesting early pocket chronometer Circa 1860

Full hunting cased 18 K gold pocket watch
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A Swiss technical interesting and early pocket watch chronometer with chain & fusee and special winding mechanism, circa 1860.
18 carat gold “à goutte” solid edition case with dome inscribed “CHRONOMETRE A FUSEE”; technical interesting chronometer movement with extravagant winding mechanism, chain / fusee, solid gold minute wheel, screwed gold chatons and pivoted detent escapement with cylindrical hairspring; white enamel dial with Roman hours, Arabic minutes, sunk subsidiary dial with Arabic seconds and blued steel hands.
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Diameter: 52 mm
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Weight: 142 g
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Signed: CHRONOMETRE A FUSEE