Swiss gold enamel and diamond set cylinder watch Circa 1860

Gold cylinder watch by Rossel Boutte & Co.
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A yellow gold enamel and diamond set open faced cylinder watch, circa 1840. Gilt jewelled cylinder movement.
White enamel dial, Roman numerals, outer minute track, yellow gold case and cuvette, bezel and back with engraved and diamond set floral motifs on a ground of blue enamel, stylised bow, case signed and numbered, with a matching yellow gold and blue enamel chain and diamond set key.
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Diameter: 37 mm
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Signed: Rossel Boutte & Co. Genève