Swiss 18K gold open faced cylinder pocket watch Circa 1870

Gold keyless cylinder watch by Vacheron & Constantin
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A fine and rare Swiss 18 carat gold open faced keyless cylinder pocket watch, circa 1870. Frosted gilt movement, 8 jewels, wolf’s tooth winding, cylinder escapement, plain three-arm flat-rim balance, blued steel flat balance spring, index regulator. Gold hinged cuvette. White enamel dial with letters spelling FREUDENREICH in place of numerals, outer minute track and Arabic five-minute numerals, subsidiary seconds and original gold spade hands. Massive, polished case. Cuvette and movement signed.
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Diameter: 45 mm
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Signed: Vacheron & Constantin Geneva Charles Vacheron & Co Successors
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The German word ‘Freudenreich’ translates as ‘joy’ in English, it is also a German surname.