Swiss silver chronometer with 50h power reserve Circa 1910

Silver open faced lever deck watch by Longines
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A fine, rare and large Swiss silver open faced keyless lever chronometer deck watch with 50-hour power reserve, circa 1910. Matte gilt movement, bar bridge-type, 21 jewels, counterpoised straight-line lever escapement, anibal-brass Guillaume balance, blued steel Breguet balance spring, micrometre cam-type regulator. Hinged silver cuvette. Matte silver dial with champlevé Breguet numerals, outer minute track, subsidiary seconds, power reserve sector below 12 and original black pear hands. Polished case, gold hinge. Dial, cuvette and movement signed. Accompanied by the original Longines numbered wooden deck box and a silver-framed photograph of Prince Vladimir Orlov.
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Diameter: 68 mm
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Signed: Longines
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This watch was owned by Prince Vladimir Orlov, it was given to him in 1920 by his wife, Tatiana, Princess Galitzine, daughter of Prince Dimitri Galitzine and Countess Helena Luders-Weymarn.