Swiss gold chronometer made for the Turkish market Circa 1850

Gold pocket chronometer by Auguste Courvoisier
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An interesting, early and rare Swiss 18 carat gold hunting cased pocket chronometer made for the Turkish market, circa 1850. Early bar movement with pivoted detent escapement, key winding. Very fine four-coloured gold dial with Turkish numerals, engraved in the centre, subsidiary seconds and original hands. Engine-turned case with relief band and engraving. Cuvette signed and numbered.
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Diameter: 49 mm
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Weight: 98 g
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Signed: Augte Courvoisier & Co Chaux-De-Fonds