Greubel Forsey NANO FOUDROYANTE EWT

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Greubel Forsey NANO FOUDROYANTE EWT



Greubel Forsey’s latest masterpiece, the Nano Foudroyante EWT, marks its 10th fundamental invention and its 20th anniversary. This limited edition watch is limited to 11 pieces and represents an approach to energy management and mechanical miniaturization. It was “Experimental Watch Technology”, hence the name EWT, and it featured a foudroyante seconds hand, a tourbillon and a chronograph.

In 2004, Greubel Forsey launched its first fundamental invention, aiming to completely rethink horology. The Nano Foudroyante is no exception, operating at the nanojoule level, significantly reducing the energy required per jump to just 16 nanojoules compared to the conventional Foudroyante's 30 microjoules. This leap reduces component volume by 90%, demonstrating Greubel Forsey’s commitment to functional micro-mechanisms without sacrificing performance. If this sounds a little too technical, let's see if we can make it a little simpler.

What is foudroyante?
In watchmaking, a "foudroyante" (French for "strike" or "lightning") refers to a complication in which a secondary hand moves rapidly to indicate fractions of a second. This complication is usually found in chronographs and allows for a more precise reading of elapsed time, usually with the hands rotating around a dedicated sub-dial, completing one complete revolution in one second. Each moment of the hand represents a fraction of a second, usually expressed in increments of 1/6 second, 1/8 second, or 1/10 second, depending on the movement of the watch.

Greubel Forsey Nano Foudroyante EWT has an accuracy of 1/6 second. The Foudroyante function is particularly prized in high-precision watches, which require movements capable of high frequencies, often exceeding the standard 28,800 vibrations per hour (vph). However, the GF’s movement vibrates 21,600 times per hour at a frequency of 3 Hz. It's more technical, showcasing the movement's ability to measure and display time with impressive precision.





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