French complicated Sonnerie repeating watch Circa 1820

Gold open faced pocket watch by watchmaker of the court Louis Mallet
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An important and probably unique highly complicated French pocket watch with Grande & Petite Sonnerie, repeater and music, circa 1820.
18 carat gold engine turned case with reeded mid section and French gold punch; dome signed and numbered. Movement, signed “Louis Mallet a Paris”, with 3 barrels: 1. gear train, 2. for Grande & Petite Sonnerie striking train in combination with the repeater, release/unlock by pendant button, 3. music movement, very high movement quality with cylinder escapement, shock absorber and temperature compensation. High-grade silver dial with Roman numerals, five minute markers and  extravagant Breguet steel hands.
All functions of this rare piece have been fully tested in 2018. The highly complicated movement is complete, but a revision is recommended.
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Diameter: 59 mm
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Weight: 147 g
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Signed: Louis Mallet a Paris
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We are not aware of any other French pocket watches in this quality. Comparable complicated French watches were only made by Breguet and his environment. From the literature we are only aware of another pocket watch of similar construction, inscribed by Yves Droz & Joseph Flores as: “Montre à Grandes Complications-Sonnerie au Passage-Repetition-Musique” (Many thanks to Mr. Christian Pfeiffer-Belli) , Louis Mallet (ca. 1790 watchmaker until 1824 listed in Paris) was named the watchmaker of the Duke of Orleans, later King Louis Philippe. In the “Almanac du Commerce de Paris” he was listed as L. Mallet et Compagnie in the Rue J(ean J(aques). Rousseau No.16.