Thematic Auction in Geneva:The Evolut...

Hotel Noga Hilton, Geneva, Nov 16, 2002

LOT 327

Albert Potter & Co., Geneva, No. 486, circa 1880.Very rare, fine possibly unique, 18K gold, moon phase astronomical watch with unusual perpetual calendar.

CHF 23,000 - 30,000

EUR 15,000 - 20,000

Sold: CHF 23,000

C. Double body, massive, "bassine et filets", the engine-turned back engraved with the monogram "C.N.C.", gold, glazed, deta-chable cuvette. D. White enamel with Roman numerals, outer Arabic minute ring, moon phase aperture and sunk subsidiary seconds with inner perpetual calendar showing only the date, with the small hand automatically jumping from the last day of the month to the first of the next, whether it is a month of 28, 29, 30 or 31 days. Blued steel "spade" hands. M. 42.2 mm (18'''), glt brass, 18 jewels, straight line calibrated lever escapement, cut-bimetallic compensation balance with blued steel Breguet balance spring.Signed on the case and movement.Diam. 51 mm..


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Grading System
Grade: AAA

Excellent
Case: 3

Good
Movement: 3*

Good

Overhaul recommended, at buyer's expense
Dial: 3 - 13 - 01

Notes

The watch incorporates an ingeniously simple perpetual calendar mechanism, which displays only the date. The mechanism "knows", although it does not display it, how many days are in each month and when it is leap year. This is an extremely rare feature in watches.