French gold watch with ruby cylinder escapement Circa 1809

Gold open faced pocket watch
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A very fine and very rare French 18K gold pocket watch with ruby cylinder escapement, circa 1809. Engine-turned and polished, reeded band, loose ring bow. Gilt metal cuvette. White enamel dial by Borel, Breguet numerals, outer minute track, secret signature below 12. Blued steel Breguet hands.

A frosted gilt movement, simple nouveau calibre, three lateral bridges, standing barrel, ruby cylinder escapement, plain three-arm brass balance with pare-chute on the upper pivot, flat blued steel balance spring, index regulator with bimetallic temperature compensation curb. Dial, cuvette and movement signed.
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Diameter: 50 mm
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Signed: Breguet  Paris
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The Breguet archives record that this watch was either lost or misplaced on 30th August 1809, this phrase was often written in the archives when a watch was even momentarily missing or mislaid at the time of inventory-taking.