Heavy Swiss Russian 18K gold complicated key less lever Circa 1913

Gold and enamel and diamond set Russian market watch by Henry Moser
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An extremely fine and very rare, large and heavy Swiss Russian 18 carat gold, enamel and diamond set hunting cased minute repeating key less lever pocket watch with perpetual calendar and moon phases made for the Russian Prince Serge Alexandrovitch Dolgorouky, circa 1913. Rhodium plated movement, Geneva Striping decoration, 31 jewels, counterpoised straight line lever escapement, the fork and escape wheel with gold jewel caps, cut bi metallic compensation balance, blued steel Breguet balance spring, swan neck micrometer regulator, repeating on gongs activated by a slide on the band. Hinged gold cuvette with champlevé enamel signatures, a glazed gold rimmed cover to view the movement. White enamel dial with Roman hours, outer minute divisions, further subsidiary dials for the seconds, date, days of the week and months with leap year indication (in Cyrillic), an aperture for the moon phases with a lunar calendar at the edge and blued steel Breguet hands. A polished case with engraved borders, band and bow, the front is decorated with the polychrome enamel coat of arms of the Dolgorouky family, a rose cut diamond set banner above and the date 1913 below, a finely painted enamel scene of a boy and girl in winter costume set with rose cut diamonds against a polished background on the back.
Dial, case and cuvette signed, movement signed and numbered.
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Diameter: 60 mm
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Signed: Hy. Moser & Cie
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This timepiece is a particularly fine and complicated example of Moser’s watches that were made specifically for the company’s Russian clientele.
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The Princely family Dolgorouky descends from Ivan Andreievitch Obolensky nicknamed Dolgorouky, a descendant of Rurikid Prince Constantin Yourievitch of Obolensk, a descendant of Mikhail Vsevolodovitch Prince of Tshernigov and Grandduke of Kiev.
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Prince Serge Alexandrovitch was born in 1883 and was Aide-de-Camp to Czar Nicholas II.
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Moser & Cie is a trademark of Moser Schaffhausen AG, a Swiss luxury watch manufacturer. The original H. Moser & Cie was founded in 1828 by the independent watchmaker Heinrich Moser in St. Petersburg, Russia. Notable early clients included the Russian princes and members of the Russian Imperial Court. Vladimir Lenin also owned a Moser watch. After Moser died in 1874, the company was sold and its business in Russia was dispossessed in 1918 due to the October Revolution.