English regulator style lunar calendar watch Circa 1770

Verge with jump fifth seconds, lunar calendar and start/stop mechanism
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A rare, oversized English gilt pair cased verge regulator style pocket watch with fifth jump seconds, the lunar calendar and start/stop mechanism, circa 1770. Full plate gilt finished verge movement, chain fusée, three armed balance wheel, pierced and engraved balance cock, silvered regulator disc, round pilasters, ruby end stone, metal dust cover. White enamel dial, single hand hour dial with Roman numerals at the 12 position, large central hand for minutes, outer calibrated minute track, two large subsidiary dials for constant seconds and lunar calendar with painted phases of the moon, smaller subsidiary dial for fifth jump seconds, all with gilt hands, start/stop lever in the band. Polished inner case with white enamel portrait of a woman on a brown background, blue and white enamel and gilt frame, an outer case with a multi-chrome enamel portrait of a woman to the back with similar blue and white enamel and gilded frame surround, engraved rims, sculpted bow. Cuvette and movement signed and numbered.
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Diameter outer case: 78 mm
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Signed: William Carpenter London