French quarter repeater with secret signature Circa 1822

Gold open faced ruby cylinder pocket watch
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A French important quarter repeating gentleman’s pocket watch with secret signature, circa 1822. Sold on October 28, 1822, to Duriveau, Officier Superieur du Genie for 1.320 Francs.
18 Carat pink gold case, case design quatre baguettes, polished, engine-turned band, pusher for repetition at 2, case maker’s punch mark LJ 58. Enamel dial, Breguet numerals, secret signature below 12,  signed: Breguet et Fils, blued Breguet hands. Bridge movement, keywind, gilt, two hammers, two gongs, ruby cylinder escapement, three-arm brass balance, blued balance spring with bimetallic temperature compensation curb on the index, shock protection parachute.
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Diameter: 53 mm
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Weight: 99 g
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Signed: Breguet, Horloger de la Marine Royale, Paris
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Lieutenant Colonel Duriveau was at the French engineering corps and later president of the l’École Polytechnique à Paris. Alexandre Dumas mentioned Duriveau in his memoirs from 1863.