Harry Winston & Speake-Marin

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. 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. 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. 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 Notes What is a Tourbillon ? A Tourbillon is a regulating mechanism in which the escapement of a movement is housed within