Since debuting in 2009, Harry Winston's Histoire de Tourbillon collection has continuously impressed with its exquisite craftsmanship and sophistication. The 2016 release, Histoire de Tourbillon No. 7, features an ingenious dual biaxial tourbillon mechanism that demonstrates Harry Winston's dedication to horological innovation.

The previous model, Histoire de Tourbillon No. 6, included a tri-axial tourbillon and two independent hour indicators - itself a remarkable achievement. However, the new Histoire de Tourbillon No. 7 elevates the complexity even further with its dual biaxial tourbillons. The watchmakers explored various designs before settling on this technically challenging but visually striking layout.

Encased in a 50.9mm white gold case, the dial has a skeletonized design that divides into two sections. The right side houses the hour and minute hands in a pyramid-cut reading area with tilted hour markers. The left features the two tourbillon cages, which rotate on different axes. A red anodized aluminium strip surrounds the tourbillons and extends to the power reserve indicator.

Designed by Greubel Forsey, the cal. HW4502 movement's plates and bridges are made of satin-finished titanium and stippled titanium. With 507 components, the movement has fewer parts than its predecessor but manages to accommodate the dual biaxial tourbillons. Using a spherical differential to optimize their concurrent operation, the two tourbillons improve rate stability through their multiple positions relative to gravity.

Limited to only 10 pieces, this novel dual biaxial tourbillon mechanism underscores Harry Winston's creativity and mastery of haute horlogerie. The present example numbered 2 is preserved in attractive condition and accompanied by its full set of accessories.