Importantes Montres de Collection

Geneva, Nov 13, 2011

LOT 131

DEWITT, REF. 8003.20, TOURBILLON FORCE CONSTANTE, PLATINUM DeWitt, Genève, "Acadamia, Tourbillon Force Constante," No. 25/25, Ref 8003.20. Made in a limited edition of 25 pieces, sold on June 6th, 2007. Extremely fine, water-resistant, platinum wristwatch with visible flying one minute tourbillon regulator, patented spherical differential system for winding the 120-hour power reserve and an 18K white gold DeWitt deployant clasp. Accompanied by the original fitted box, certificate of authenticity and instruction manual.

CHF 55,000 - 70,000

USD 60,000 - 75,000 / EUR 45,000 - 55,000

Sold: CHF 68,500

C. Three-body, solid, polished, notched platinum bezel, straight lugs, transparent back with 6 screws, sapphire crystals. D. Grey, applied gold Arabic, dot and Roman numerals, force constante indication at 9, aperture for the tourbillon at 5. White gold epee hands. M. Cal DW 8003, rhodium-plated, fausses cotes decoration, 26 jewels, lateral lever escapement, one-minute fl ying tourbillon with special 3 arms Gyromax-type balance timed in 6 positions, shock absorber, self-compensating fl at balance spring. Dial, case and movement signed. Diam. 43 mm. Thickness 13 mm.


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Grading System
Grade: AA

Very good
Case: 2

Very good
Movement: 2*

Very good

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

Very good

HANDS Original

Notes

What is a Tourbillon Regulator? 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 diffi cult and complex achievement by any watch manufacturer