Swiss three colour gold watch set with rubies Circa 1820

Ruby set three colour gold watch
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A Swiss three colour gold open face watch set with rubies, circa 1820. Purpose made English full plate gilt keywind fusee movement. Harrison’s maintaining power. Plain cock, polished steel regulator, plain three-arm gold balance with blue steel spiral hairspring. English table roller lever escapement. Engine turned gold dial with a small chapter of Roman numerals, broad decorative three colour gold border and gilt hands. Decorative three colour gold open face case set with rubies in a geometric pattern. Wound through the gilt cuvette signed ‘Jn Ls Debrit a Geneve’.
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Diameter: 41 mm
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Signed: Dan Desbois London