Harry Winston has just released the fourth installment of the Histoire de Tourbillon series, which began 2009 as new and interesting ways of presenting a tourbillon watch. Histoire de Tourbillon 4 is one of the most complex mechanical timekeepers ever made.
Its main feature is a unique triple-case tourbillon that is a tourbillon inside of a tourbillon inside of a tourbillon, each rotating at different rates per minute. The outermost cage completes a revolution once every 300 seconds (5 minutes), the intermediate cage rotates once every 75 seconds, and the innermost cage spins once every 45 seconds.
This stunning timepiece with its 47mm wide cushion-shaped case is made from a mix of Zalium (a Harry Winston alloy similar to titanium) and 18k gold. The The crown is white gold, with rubber grip. The thickness of the watch including the dome is 21.7mm. Inside the watch is their new caliber HW4501 that is manually wound with a 50 hour power reserve.
Over 3,500 hours of painstaking labor were required to develop Histoire de Tourbillon 4, and further testing and homologation of this most high performance of movements consumes over 400 additional hours. The most skilled watchmakers take a full 160 working hours to assemble the 345 movement components, which are then placed in a luxurious 18k polished white gold case, with Harry Winston’s signature ZaliumTM case band, arches, lugs.
Harry Winston will produce only 20 pieces of Histoire de Tourbillon 4, as penultimate watch of its Histoire de Tourbillon watch collection.