Important Collectors' Wristwatches, P...

Geneva, May 08, 2010

LOT 148

Harry Winston & Speake-Marin, Project Z3 Sport Tourbillon Harry Winston developed with P. Speake-Marin, "Project Z3 Sport Tourbillon 110 Hours", No. 20/80, case No. 029864, Ref. 400-MAT44W. Made in a limited edition of 80 pieces in 2006. Very fine and rare, large, 18K white gold, self-winding, water-resistant wristwatch with visible one-minute tourbillon, 110 hours power-reserve and an 18K white gold Harry Winston buckle. Accompanied by a Harry Winston fitted box and 2 year guarantee.

CHF 65,000 - 90,000

USD 62,000 - 85,000 / EUR 45,000 - 63,000

Sold: CHF 81,600

C. Two-body, solid, polished and brushed, flat band, protected screw-down winding crown, inclined bezel, hinged curved lugs, transparent back with 7 screws, sapphire crystals. D. Offset brushed blued steel chapter ring with radial blue Superluminova Arabic numerals, inner silvered ring with baton indexes, aperture at 6 for power-reserve warning display, blued steel dial plate with cotes de Genève decoration, aperture below for the tourbillon display with seconds ring on the border, polished steel plate. White gold and blue luminova hands. M. Cal. HW401A, black plates with fausses cotes and oeil-de-perdrix decoration, 34 jewels, lateral lever escapement, monometallic balance, self-compensating flat balance spring, brushed steel one-minute tourbillon carriage with three equidistant curved arms and blued steel screws. Dial, case and movement signed. Diam. 47 mm. Thickness 15 mm


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Grading System
Grade:
Case: 1

As new
Movement: 1

As new
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.