Important Collectors’ Wristwatches, P...

Geneva, Nov 16, 2008

LOT 486

Pivoted Detent Chronometer Augustin Perret, Genève, No. 10498 Made for the Hispanic market, circa 1890. Very fine and rare, 18K yellowgold, hunting-cased, keyless pocket chronometer with pivoted detent escapement and amplitudecontrolling device.

CHF 8,500 - 11,000

USD 8,000 - 10,000 / EUR 5,500 - 7,000

C. Four-body, "pomme et filets", engine-turned covers with cast flower and scroll borders, the front cover with vacant cartouche, curved band cast and chased with flowers and scrolls. Hinged gold cuvette with engine-turned border, hinged glazed gold-rimmed cover to view the movement. D. Silver with black painted radial Roman numerals, subsidary seconds, applied yellow gold foliate outer border, the center with applied yellow gold decoration. Yellow gold and rose-cut diamond-set hands.M. 19''', maillechort, 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 springwith inner and outer terminal curves, amplitude controlling device, index regulator. Cuvette signed and numbered, case numbered. Diam. 54 mm.


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Grading System
Grade: AA

Very good
Case: 3

Good
Movement: 3*

Good

Overhaul recommended, at buyer's expense
Dial: 3-9-01

Good

Scratched

HANDS Original

Notes

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. This watch is illustrated and discussed in: Dispositifs anti-galop dans les chronomètres de poche, Adolphe Chapiro, Bulletin Ancaha, No. 57, Spring 1990.