French deck watch with 49h power reserve indicator Circa 1840

Silver open faced deck watch by Joseph Thaddäus Winnerl
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An important, small French ship’s chronometer with 49 hour power reserve indicator in mahogany box, circa 1840.
Brass bowl with glazed bezel secured by two screws, gimbaled in two-body mahogany box with glazed round window in the top under sliding lid, brass handles, corner plate for a key with original fluted handle brass key, key lock in front, gimbal ring locked by single arm protruding through the ring and boss on the bowl. Signed, numbered, silvered dial with radial Roman hour numerals, outer minute ring, auxiliary seconds at XII, up-and-down indicator at VI o’clock and blued Breguet hands. Brass movement, diameter 63 mm, moulded pillars, chain/fusee, spring detent escapement according to Thomas Earnshaw, ground screws, heavy chronometer balance with two weights and four screws, blued helical freesprung balance spring, chatoned diamond endstone on balance, chatoned ruby endstone on escape wheel.
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Diameter: 63 mm
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Box: 145 x 140 x 145 mm
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Signed: Joseph Thaddäus Winnerl à Paris
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Joseph Thaddäus Winnerl (1799-1886)
Joseph Thaddäus Winnerl was born in Austria (Styria) in 1799. From 1829 he lived and worked in Paris, where amongst other constructions he designed a split second mechanism for chronographs. In 1839 Winnerl won gold medal in Paris. He was an excellent maker of chronometers and balances and even invented his own compensation balance. Ferdinand Adolf Lange worked for him until