Swiss silver watch with double 12 hour numerals Circa 1823

Silver open faced cylinder pocket watch
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A very fine Swiss, extremely rare silver open faced 24 hour pocket watch made by Joseph Avon in Geneva, circa 1823. The polished case with a hinged gilt metal cuvette. White enamel dial with Arabic hour numerals from 1 to 12 twice for day and nighttime hours, an outer minute track, subsidiary seconds at 6 o’clock and blued steel Breguet hands. A matte gilt movement, Lépine caliber, standing barrel, jewelled cylinder escapement, gold three arm balance wheel, flat blued steel balance spring, polished steel endplate an an index regulator. Dial signed, cuvette signed Avon Horloger A Apt.
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Diameter: 58 mm
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Signed: Joseph Avon Genève 1823 Invenit et Fecit
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This watch is a very rare example of a 24 hour watch with numerals 1 to 12 in each half of the dial. The hour hand only makes one revolution every 24 hours instead of every 12 hours.