The newest version of Greubel Forsey's mesmerizing Double Tourbillon 30° Technique has a carved crystal case, so you can see the movement from every angle.

The Double Tourbillon 30° Technique in an all-sapphire case. Source: Greubel Forsey

The Double Tourbillon 30° Technique in an all-sapphire case. Source: Greubel Forsey

Cut from a single large sapphire crystal, including the rounded, multi-angular case horns, the entire movement is flooded with light within its 38.4mm case, allowing a view into its multi-tiered design from all angles. This is a more complicated watch than the Hublot, and uses sapphire in more places, including the crown. 

The reverse of the Double Tourbillon 30° Technique in all-sapphire. Source: Greubel Forsey

The reverse of the Double Tourbillon 30° Technique in all-sapphire. Source: Greubel Forsey

Its actual 396-part movement may not be new—the patented tourbillon movement was first unveiled in platinum—but now its prowess is on full display. The hand-wound caliber, with 120-hour power reserve, packs two tourbillon escapements, one inside the other. Two tourbillons that rotate at different speeds are showcased here: An outer tourbillon rotates every four minutes while an inner tourbillon, every 60 seconds. All of this has helped the movement achieve a never-before-seen 915 out of a possible 1,000 points at the International Chronometry Competition.

Exclusive to the U.S. market in an edition of eight pieces to be individually created by hand over the course of the next three years, the watch is priced at $1.275 million.

The Double Tourbillon 30° Technique in sapphire, from the side. Source: Greubel Forsey

The Double Tourbillon 30° Technique in sapphire, from the side. Source: Greubel Forsey

Source: Bloomberg Pursuits     Photos: Greubel Forsey

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