French Silver extremely interesting pocket chronometer Circa 1845

Very early chronometer former property of the nobility
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A rare and extremely interesting, numbered, very early French pocket chronometer, former property of the nobility, made by Simon Vissiere, watchmaker of the Imperial Navy, le Havre, France, circa 1845. The numbered open faced case of this chronometer was crafted from silver by the case maker E. Jacot, its dust cover is numbered and inscribed “Const^r. de Chronomètres, Fourn^r. de la Marine Impériale and it has an engine turned back lid with an aristocratic monogram. The white enamel dial has Roman hour numerals, a subsidiary seconds dial at 6 o’clock and fine Breguet steel hands. The movement has an extremely interesting Chronometer escapement with a huge chronometer balance, a special lever, a particularly long regulator hand and a key winder.
Dial and dust cover are signed.
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Diameter: 52 mm
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Weight: 107 g
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Signed: Vissière, Havre
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This watch is an interesting collector’s item for chronometer collectors.
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Simon Vissière
This watch is  probably Vissière’s earliest surviving pocket chronometer. Simon Vissière was born in Paris in 1822 and died in 1887. As a student of Winnerl, he was particularly well known for his research on amagnetism.