The House of Harry Winston unveils the sixth chapter of Histoire de Tourbillon. The sixth edition of this high complication collection will be equipped with HW4701 caliber, the most complex in the Histoire de Tourbillon series. A genuine first in the history of horology, it combines two independent hour indications: one regulated by a tri-axial tourbillon and the other by a karussel. Both karrusel and tourbillon operate in a similar manner and feature the same exceptional precision-rating qualities. The impressive white gold case is designed to fit the contours and accompany the technical constraints of a movement distinguished by its unique complexity and construction.
The Histoire de Tourbillon 6 movement is composed of two independent parts, like two heads on a single body. Hours and minutes are displayed on one side, regulated by the tri-axial tourbillon. They are recognizable by their color coding – orange against a gray background – and housed within a rounded protrusion on the case. The right side of the watch is distinguished by its blue hands and markings against a black backdrop. It features a dial with hands that can be started, stopped and reset at will. A blue ceramic pusher at 2 o’clock allows this superlative creation to display the elapsed hours and minutes like a chronograph. This unique and versatile function also drives a dual-time display that may be adjusted as desired via the 3 o’clock crown.
The varying rotation angles and speeds of the tourbillon and karussel play a decisive role in chronometric performance, which is the watch’s accuracy. Together they counteract the detrimental effects of gravity. Precision is further enhanced by the fast rotating twin barrels, boasting an exceptionally regular torque.
A few figures highlight the incomparable complexity of this timepiece. Caliber HW4701 is made up of 683 parts. Its tri-axial tourbillon alone requires 141 parts and weighs a mere 1.85 grams. This voluminous graphic structure is visible beneath four sapphire crystals, all distinguished by convex and complex shapes.
With this regulator, time displays can be personalized. The movement on the right side is akin to a monopusher chronograph and replicates that function. Its hands, however, are adjustable via a crown at 3 o’clock. Therefore, they can provide a dual-time display that is accurate to the nearest minute. This rare capability is ideal for offset time zones such as India (UTC +5:30), Caracas (UTC – 4:30) or Katmandu (UTC + 5:45).
Despite its exceptional dimensions, 64 mm from crown to crown, Histoire de Tourbillon 6 has a comfortable fit. The mainplate and bridges, forming the structure of the movement, are made of titanium, a metal chosen for its light weight. The case is fitted with ergonomic lugs. Aligned with the large hand-sewn alligator strap, they seamlessly follow the curves of the wrist.
The case is crafted using a white gold alloy with a high palladium content, giving it an attractive glow and radiating a matte sheen that expertly matches the distinctive look of the movement’s surface. It is entirely hand-beveled and sandblasted to give it a granular texture before undergoing an NAC galvanic treatment, which coats it with a black metal layer. The rendering is both sophisticated and striking, and entirely in harmony with the technical nature of the timepiece.
The exclusive nature of Histoire de Tourbillon 6 is amplified by its limited production, a result of the exceptional complexity of Caliber HW4701. As in the previous chapters of the Histoire de Tourbillon by Harry Winston, only 20 will be made.
Model: Histoire de Tourbillon 6
Display of the hours, minutes, seconds and power reserve
Hours and minutes counter with zero-reset function equipped with carriage stop. Movement operating indicator and power reserve indicator (Power Reserve gauge)
Diameter: 40.90 mm x 45.08 mm
Height: 17.30 mm
Number of components & Weight
Complete movement: 683 components
Tourbillon: 141 components
Karussel: 100 components
Tourbillon weight: 1.85 g
Karussel weight: 0.697 g
Number of jewels: 90
Tri-axial tourbillon: up to 80 hours
Karussel: up to 70 hours
Barrels: Two sets of twin fast-rotating series-coupled co-axial barrels equipped with slipping spring in order to avoid excess tension
Balance wheel: Variable-inertia type equipped with gold adjusting screws
Frequency: 21,600 vibrations/hour (3Hz) for each balance wheel
Balance spring: Phillips terminal curve and Geneva-type stud for each balance wheel
Mainplate: Titanium, shot-peened and chamfered, PVD-coated
Titanium bridges, shot-peened and chamfered, PVD-coated
Screws with S-type slotted mirror-polished heads, shot-peened and chamfered
Inner carriage containing the balance wheel and escapement pinion with 45-second rotation cycle
Intermediate carriage with 75-second rotation cycle
Outer carriage with 300-second rotation cycle
Carriage rotation in 30 seconds
Excentered polished rhodium-plated orange SLN Hours and Minutes in a counter at 10 o’clock
Seconds indicator on the tri-axial tourbillon carriage at 8 o’clock
Polished rhodium-plated orange SLN of the Hours and Minutes’ power-reserve at 12 o’clock
Open-worked chronograph hours and minutes in untreated Avional at 3 o’clock
Chronograph operating indicator at 2 o’clock
Polished rhodium-plated blue SLN chronograph power reserve
5 o’clock Chronograph karussel at 1 o’clock
18K white gold, polished, satin-brushed and shot-peened
Blue ceramic pusher
Diameter: 55 mm x 49 mm (edges of the bezel)
Height: 21.80 mm
Shaped sapphire crystal for the 3 o’clock zone with antireflective treatment on both sides
Shaped crystal for the 10 o’clock hours and minutes zone with anti-reflective treatment on both sides
Domed sapphire crystal on the tourbillon with anti-reflective treatment on both sides
Case back: Open; Sapphire crystal with anti-reflective treatment on both sides
Water resistance: 3 bars
Crown: 18K white gold and rubber
Hand-sewn black alligator leather
Buckle: 18K white gold double ardillon buckle
Limited edition of 20
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