French complicated calendar watch with 24 hour dial Circa 1790

Silver open faced calendar watch by Poudra
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A French silver open faced calendar watch with 24 hour dial, moon phases, sunrise and sunset, circa 1790. The watch features a gilded full plate movement with a cylinder escapement and a pierced and engraved balance bridge. It is also signed Poudra A Paris. It has a white enamel dial with a black bottom section indicating nighttime, Roman numerals, subsidiary dials for subsidiary seconds combined with moon phases, day and date, and a fanform aperture for sunrise and sunset. The silver, engine turned dial has a milled band and some indistinct marks.
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Diameter: 59 mm
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Signed: Poudra A Paris
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The movement is not operational, and the calendar is not advancing. The left side of the dial has multiple cracks, the subsidiary seconds dial has chips and cracks, and the sunrise and sunset plates have damage. The hands are loose. The case shows tarnishing throughout, but the engine turning remains in good condition.