Swiss gold, enamel and diamond-set lever watch Circa 1880

Gold, enamel and diamond-set watch made for the Turkish market
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An 18k gold Swiss enamel and diamond-set hunter cased keyless lever watch made for the Turkish market, circa 1880, nickel damascened cylinder movement, plain three arm balance, gold cuvette signed Girard Perregaux Chaux de Fonds.
White enamel dial, Turkish numerals, unusual subsidiary seconds, case with a royal blue translucent enamel panel set with a geometrical patterns of diamonds in the centre, surrounded by gold engraved arabesques, the back similarly enamelled and centred by a diamond-set floral motif, framed by gold engraved arabesques, cuvette signed.
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Diameter: 40 mm
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Signed: Girard Perregaux Chaux de Fonds