Highly interesting French silver chronometer pocket watch Circa 1845

Silver pocket chronometer by Vissière
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A very early, rare and highly interesting French silver pocket chronometer, circa 1845. Chronometer movement, extra-large chronometer balance, special lever, extra-long regulator hand, key winding. Cuvette inscribed Constructr. de Chronomètres Fournr. de la Marine Impériale. White enamel dial with Roman hours and outer minute divisions, subsidiary seconds, fine steel Breguet hands. Engine-turned case with gold hinges, the back with applied nobility monogram, case maker E. Jacot. Case numbered, dial signed, cuvette signed and numbered.
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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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Former aristocratic property.
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This is probably the earliest pocket chronometer still preserved by Vissière. Simon Vissière was born in Paris in 1822 and died in 1887. As a student of Winnerl, he was especially known for his research on anti-magnetism. In 1867 he founded his own personal observatory in Le Havre.