French silver retrograde hour watch with date Circa 1790

Rare unusual silver retrograde hour watch with date

A rare unusual French silver retrograde hour open faced watch with date, circa 1790, gilt full plate chain and fusee movement with verge escapement.
White enamel dial, Arabic numerals, blue fan-form sector for retrograde hour display, date at 6 o’clock.
Silver case, case numbered.
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Diameter: 55 mm
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Signed: No Name