French pocket chronometer with gun shaped key Circa 1841

Silver open faced chronometer by Breguet
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A fine and rare French silver open faced pocket chronometer with a gun shaped winding key, circa 1841. Sold to Comte de Gourieff on 17 June 1841. Gilt brass full plate movement, chain fusée, Earnshaw type spring detent escapement, two armed bimetallic compensation balance with poising weights and timing screws, diamond endstone, freesprung blued steel helical balance spring with terminal curves, gilt metal cover. White enamel dial with Roman numerals, large subsidiary seconds to 12 o’clock. Massive engine turned silver case, rose gold hinges. Case numbered 4988 and 1075 and stamped with casemaker’s initials LJ for Louis Joly, cuvette signed Breguet Neveu & Cie, dial signed Breguet, movement signed Breguet & Fils.
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Diameter: 59 mm
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Signed: Breguet Neveu & Cie – Breguet & Fils
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Alexander Dimitrievitch Gourieff (31 May 1786 – 16 December 1865) was a Russian General during the Napoleonic wars and then the minister of finances. His father Dimitri Gourieff was the minister of apanages under Alexander 1st, and the brother-in-law of chancellor Nesselrode.