Double Tourbillon Technique Black / Greubel Forsey

Greubel Forsey‘s Double Tourbillon Technique Black has the double tourbillon (one rotating inside the other) at 6 o’clock on a 30 degree tilt. The inner cage rotates once every 60 seconds and the outer cage rotates once every four minutes. The mechanism has a four-pointed indicator tracking the seconds on a 60-seconds register at the bottom of the dial, so you can clearly see the pace of both tourbillons at once — via HODINKEE

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Photos from Flickr