Important Collectors' Wristwatches, P...

Hong Kong, Jun 27, 2009

LOT 106

Platinum Tourbillon No. 18 Girard-Perregaux, La-Chaux-de-Fonds, "Tourbillon Reserve de Marche", No. 18, Ref. 9920. Made in the 1990s. Extremely fine and rare, platinum wristwatch with visible oneminute tourbillon regulator under one 18K pink gold bridge, power reserve and an 18K white gold Girard-Perregaux deployant clasp. Accompanied by a fitted box and a blank certificate.

HKD 300,000 - 400,000

USD 43,000 - 57,000 / EUR 30,000 - 40,000

C. Three-body, solid, polished and brushed, case back with 6 screws, curved lugs, sapphire crystal. D. Guilloche silver with radial Roman numerals on a plain reserve, at 6 a polished 18K pink gold bridge over the visible one-minute tourbillon regulator with its "A"-shaped carriage and blued steel seconds hand, aperture for the power reserve at 12. Blued steel spade hands. M. Cal. T3P, rhodium-plated, fausses cotes and oeil de perdrix decoration, 20 jewels, lateral lever escapement with one-minute tourbillon regulator, tourbillon carriage of the type designed by Ernest Guinand, monometallic balance adjusted to 6 positions, shock absorber, self-compensating Breguet balance spring. Dial, case and movement signed. Diam. 39 mm. Thickness 10 mm


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Grading System
Grade:
Case: 2

Very good
Movement: 2

Very good
Dial: 1-01

As new

HANDS Original

Notes

What is a Tourbillon ? A Tourbillon is a regulating mechanism in which the escapement of a movement is housed within a revolving carriage. It was developed in an effort to attain better precision. When a watch is in a vertical position, the force of gravity will speed the balance wheel as it moves in its downward (arc) direction and slow it as it moves upward, creating deviational errors of timekeeping. By placing the balance and escapement in a carriage that revolves 360° per minute, these errors become averaged and the timekeeping becomes constant and consequently adjustable. Created by Abraham Louis Breguet in 1795, the tourbillon is considered a difficult and complex achievement by any watch manufacturer.