Russian calendar watch with dead centre seconds Circa 1850

Gold detent pocket chronometer by Paul Buhré
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A large and heavy gold Russian triple calendar two train pivoted detent pocket chronometer with dead centre seconds and quarter repetition, made for the Russian market, circa 1850. This watch features a frosted gilded movement, highly jewelled, pivoted detent escapement with gold escape wheel, triangular locking jewel, free-sprung bimetallic compensation balance with blued steel spherical spring, fusee and chain. It also includes an independent seconds train with a standing barrel, two polished steel hammers repeating on coiled gongs, and is signed Moulinié on a pillar plate beneath the dial. The dial is white enamel with Roman numerals, an outer minutes/seconds ring, and four subsidiary dials for day, month, date, and seconds, with blued steel fleur de lys hands.
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The case is 18k gold, heavily chased and engraved throughout with stylized flowers, foliage, and geometric motifs, with a band and bow similarly decorated. It also has a repeating slide and stop slide for the centre seconds, a large diamond-set pendant, and a polished gold cuvette with apertures for winding and hand-setting, signed Paul Buhré, Pétersbourg, and with a black champlevé enamel foliate border, with all covers numbered 31226.
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Diameter: 61.5 mm
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Signed: Paul Buhré, Pétersbourg
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The movement is functioning, but it may benefit from a service. The jumping seconds hand and its stop slide are operating correctly. The repeating function is also operational. The dial has a hairline crack from the edge at 10 o’clock running to the day subsidiary dial, and a further hairline crack at the base by 6 o’clock running to the subsidiary seconds dial. The case is in very good condition, retaining clean definition to the decoration, and the covers close firmly.
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Deadbeat seconds, also called dead seconds or jumping seconds, is a mechanical watch in which the seconds hand ticks once a second, like any cheap, garden-variety quartz watch.