Greubel Forsey Nano Foudroyante EWT with Flying Tourbillon: Lightning Fast Monopusher Chronograph using Minimal Energy in a Very Wearable 38mm Case
A foudroyante hand is visually spectacular as it is running faster than the eye can follow – foudroyante is French for lightning fast! But the complication uses a lot of energy, or did until the Greubel Forsey Nano Foudroyante EWT.