Swiss 18K gold with dual time zone and compass Circa 1820

A Swiss gold key wind full hunter pocket watch with dual time zone and compass, circa 1820. Gilt Swiss lever movement, cut and compensated bimetallic balance. White enamel dial, offset Roman and Turkish numeral hour dials, black outer 1/2 second markers, compass at 6, black hands, centre seconds. Engine turned hinged case, monogram to front and foliate engraving to inside case front. Cuvette signed. Accompanied by 18 carat chain, gilt locket and key.
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Diameter: 49 mm
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Signed: Siegrist & Cie Chaux de Fonds