French deck chronometer, power reserve Circa 1850

Brass two day marine chronometer in ebony deck box by Winnerl
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A fine, rare French two day marine deck chronometer with 49 hour power reserve indicator, circa 1850. Possibly made for the Duc de Morny (1811-1865). Brass full plate movement, spotted decoration, turned pillars, secured by screws, reversed fusee and chain, maintaining power, Earnshaw spring detent escapement, jewelled locking stone, cut bimetallic compensation balance with two cylindrical weights and four adjustment screws, blued steel freesprung helical balance spring with inner and outer terminal curves, diamond endstone. White enamel dial, secured by a single screw, with Roman hour numerals, outer minute track, large Arabic seconds on subsidiary dial at 12 o’clock, 49 hour power reserve sector at 6 o’clock and original blued steel Breguet hands. Plain brass box type bowl with glazed bezel secured by two screws, the three tier ebony deck box with very fine brass inlay of oak boughs and leaves, key concealed in the base, central coat-of-arms and the motto Tace Sed Memento, the interior of the second tier similarly inlaid with flower sprays. Dial signed.
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Diameter bowl: 78 mm
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Dimensions box: 128 x 107 x 60 mm
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Signed: Winnerl
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Charles Auguste Louis Joseph Demorny/de Morny, 1st Duc de Morny, (1811 – 1865) was a French statesman and the natural son of Hortense de Beauharnais (wife of Louis Bonaparte, queen of Holland) and Charles Joseph, comte de Flahaut. He was therefore half brother of Emperor Napoleon III, son of Hortense de Beauharnais.
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The motto under the coat-of-arms on the deck box ‘Tace Sed Memento’ is the motto of Charles Auguste Louis Joseph Demorny/de Morny, 1st Duc de Morny, 1811-1865. However, the coronet is that of a Vicomte and we have been unable to identify the crest definitively. A further interesting connection is that it is known that the Duc was particularly fond of fine marquetry. A marquetry table formerly in his possession is now in the Musée Nissim de Camondo, Paris.