Rare Swiss gold watch with dual meantime dials Circa 1790

Gold open faced verge 
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An extremely rare Swiss 18K gold pocket watch with dual meantime dials, circa 1790. One with a 24-hour rotation and a dual-date calendar. White enamel dial with outer Arabic numerals for the 24-hours, 12-12 and 12-24 in each half, the hour hand making one rotation in a 24-hour period, outer minute track, further subsidiary meantime dial with Arabic numerals and outer minute divisions, date and days of the week dials and fine pierced gold tulip hands. A gilt brass full plate movement with turned pillars, fusee and chain, verge escapement, plain brass three-arm balance, flat balance spring, continental cock with polished steel endplate, silver regulation dial. Dial and movement signed.
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Diameter: 54 mm
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Signed: Ch.t Moricand  Genève
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Slightly restored enamel on the dial.
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This rare watch has the feature of a 24-hour dial which requires special gearing beneath the dial to facilitate the main hour hand to make one revolution in a 24-hour period, the smaller meantime dials making the usual 12-hour rotation. Both dials are set to the same time and the purpose of the watch was to allow the wearer to know if it was daytime or night. The small dial provides the time at a glance, and then the diurnal and nocturnal hours are read from the 24-hour dial. Christian Moricand (1715-1791) was a watchmaker who from 1752 to 1755 was associated with his brother Benjamin and François Colladon. Several other associations followed.