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Crystal clear: This transparent sapphire watch is worth $1.28 million

No metal is used at all in the creation of the dial and case, allowing for a panoptic view of as much of the movement architecture as possible.

Bloomberg|
Last Updated: Jun 20, 2016, 05.07 PM IST|Original: Jun 20, 2016, 05.07 PM IST
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No metal is used at all in the creation of the dial and case, allowing for a panoptic view of as much of the movement architecture as possible.
No metal is used at all in the creation of the dial and case, allowing for a panoptic view of as much of the movement architecture as possible.
From Greubel Forsey, maker of what are some of the most supercomplicated timepieces in the world, comes the Double Tourbillon 30° Technique.

It’s a watch the company’s made for a while, but now it’s offered in, you guessed it, an all sapphire case. Greubel Forsey calls it the “pinnacle of transparency”, and it’s easy to see why.

No metal is used at all in the creation of the dial and case (save for the winding pin), allowing for a panoptic view of as much of the movement architecture as possible.

Cut from a single large sapphire crystal, including the rounded, multiangular case horns, the entire move-ment is flooded with light within its 38.4mm case, allowing a view into its multi-tiered design from all angles. This watch uses sapphire in several places, including the crown.

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 calibre, 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. The watch costs $1.275 million.
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