Swiss 18K gold clock watch with Grande & Petit Sonnerie Circa 1870

Rare gold cylinder clock watch by Henri Grandjean & Co.
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A very fine and rare, large, 18K gold, two-train, Swiss Grande and Petite sonnerie clock watch, with a selection lever for Grande or Petite sonnerie and another for silence placed under the bezel, circa 1870.
Four-body, bassine et filets, florally chased and engraved band and bezels, the back with a taille douce engraved young lady. Frosted solid silver dial with applied gold foliate border, centre with applied gold flowers, rose and foliage, radial gold applied Roman numerals and Breguet hands. Gilded brass movement with ruby cylinder escapement. Signature on the cuvette.
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Diameter: 58 mm
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Signed: Henri Grandjean & Co.
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Henry Grandjean was one of the first to enter the South American Market. He was also one of the first to manufacture marine chronometers in Switzerland and was an initiator of the Neuchâtel Observatory. Grandjean received a First Class medal at the 1851 Universal Exposition in London. In 1868 the company won an award for its marine chronometers. Henry died in 1879, but the company continued until 1899.