Ultra thin French hunting cased cylinder watch Circa 1850

Rose gold and enamel keywound full hunter by Guyon 
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A fine, ultra thin French 18 carat rose gold and enamel hunting cased keywound cylinder pocket watch, circa 1850. Gilt finished cylinder movement, three armed balance. Gold cuvette. Silvered guilloché dial, central zone with scroll design, outer chapter ring with Roman numerals and outer minute track. Case with polychrome enamel design to front and back covers, polychrome enamel to the bow. Cuvette signed, case numbered.
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Diameter: 36 mm
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Signed: Guyon à Lyon