In January of 2017, Greubel Forsey announced that it had been experimenting with nanomechanical wristwatch technology – that is, the use of micro-scale components, in order to make new display systems possible and also to dramatically increase the performance of mechanical watches. (True nano-scale structures are atomic scale, so the term "nano" is perhaps a bit of poetic license; however as you'll see, the components in the Nano Foudroyante EWT are much smaller than those ordinarily seen in watchmaking.) The original announcement teased a watch that would have a regulating system so compact, and so efficient, that it could theoretically have a 180 day power reserve, which would obviously be unprecedented. Greubel Forsey has just released the latest news on the evolution of the concept: a watch with a foudroyante seconds hand complication that uses only 1/1800 the energy of a traditional foudroyante seconds hand, and which is 96% smaller than the usual mechanism. This is the third basic invention in Greubel Forsey's Experimental Watch Technology program – the others are the synthetic diamond Binomial escapement of 2009, and the Différentiel d'Egalité (a spherical differential remontoire d'egalité, patented in 2006).