Important Collectors’ Wristwatches, P...

Geneva, Mandarin Oriental Hotel Du Rhône, Oct 15, 2006

LOT 237

?Perpetual Calendar? Ed. Koehn, Genève, No. 64340. Made circa 1920. Very fine and rare, astronomic, 18K yellow gold keyless pocket lever chronometer with perpetual calendar, moon phases and lunar calendar.

CHF 9,000 - 11,000

EUR 5,700 - 7,000 / USD 7,500 - 9,000

Sold: CHF 16,520

C. Four-body, ?bassine?, polished. Hinged gold cuvette engraved with the technical details. D. White enamel with black Breguet numerals, outer minute track, subsidiary dials for the months and four-year cycle, the date, day of the week, seconds combined with lunar calendar (in red), aperture for the phases of the moon. Black ?Breguet? hands. M. 1st quality, 19???, rhodium-plated, 21 jewels, wolf?s tooth winding, straight-line ?moustache? lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring with double overcoil, micrometer regulator. Cuvette signed. Diam. 52 mm.


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Grading System
Grade: AAA

Excellent
Case: 3

Good
Movement: 3*

Good

Overhaul recommended, at buyer's expense
Dial: 2-01

Very good

HANDS Original

Notes

Edward Koehn (1839-1908) was the son of Karl Koehn, a watchmaker to the court of the Grand Duchy of Saxe-Weimar-Eisenach. He came to Geneva in 1859, and studied at the Ecole d?Horlogerie. In 1861, he began working at Patek Philippe, as a simple employee. After 15 years of loyal services, he became Director. In 1891, Edward Koehn left Patek and bought the Robert Ekegren firm. Koehn constructed very high quality flat and extra-flat watches, repeating watches, chronographs, and fly-back chronographs. The firm, at the Grand Quai, made watches for Tiffany, New York, and on June 8, 1912, patented a watch with hanging barrel and pendant winding, the ?Roseau?, under the No. 31470; the ?Thermindex? on the 13 February, 1922 under the No. 51304. Dictionnare des horlogers genevois, by Osvaldo Patrizzi, Antiquorum Editions, 1998