Swiss silver verge watch with sun and moon dial Circa 1800

Silver sun and moon pocket watch
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A rare Swiss silver open faced verge pocket watch with sun and moon dial, circa 1800. An unusual slim gilt full plate fusee movement, barrel and fusee under a profusely engraved plate standing higher than the rest of the train, pierced and engraved bridge cock, broad engraved feet, steel coqueret, plain gilt three-arm balance with blue steel spiral hairspring.
A rare polychrome enamel dial depicting a church with its clock tower, Arabic numerals in a semi-circle above, the hours indicated by a polychrome enamel disc which rotates once every 24 hours, viewed through the large aperture with on one half the sun in a clear blue sky and on the other the moon among clouds, at the edge of the semi-circle the hours are marked from 6 to 12 and back to 6 again in Arabic numerals, as the sun disappears at the right of the aperture the moon appears at the left, to the centre a small white square forms the face of the church clock marked at the quarters in Roman numerals, the miniature hand rotating once an hour. Plain case with ribbed band.
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Diameter 53 mm
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Signed: No name
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This timepiece is a very rare and late example of a sun and moon watch using a novel way of indicating the minutes.