Swiss gold chronometer for the Hispanic market Circa 1890

Gold hunting-cased chronometer with amplitude controlling device
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A very fine and rare Swiss 18-carat gold hunting-cased keyless pocket chronometer with amplitude controlling device made for the Hispanic market, circa 1890. Movement with wavy line decoration, 12 jewels, four in screwed gold chatons, pivoted detent escapement, cut bimetallic compensation balance with meantime and temperature adjustment screws, blued steel helical balance spring with inner and outer terminal curves, amplitude controlling device, index regulator. Gold hinged cuvette with engine-turned border, hinged glazed gold-rimmed cover to view the movement. Silver dial with black painted Roman numerals, subsidiary seconds, gold foliate outer border, the center with applied gold decoration, original gold, and rose-cut diamond-set hands. Engine-turned covers with cast flower and scroll borders, the front with vacant cartouche, curved band cast and chased with flowers and scrolls. Cuvette signed and numbered, case numbered.
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Diameter: 54 mm
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Signed: Augustin Perret Genève
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The amplitude limiting device, or ‘anti-galop’ feature, is a small length of blued steel mounted on one of the turns of the balance spring and at right angles to its surface, the pin is positioned so that if the amplitude of the balance spring is too great the pin touches the balance cock and stops the spring’s expansion.