Introduction of the Nano Foudroyante
The Nano Foudroyante, introduced last year as a pioneering timepiece and the brand’s inaugural chronograph, is now officially part of Greubel Forsey’s regular production lineup. This addition, however, is presented as a limited-run edition, consistent with the brand’s tradition. The latest iteration retains all the essential features of its earlier Experimental Watch Technology (EWT) version, which we thoroughly reviewed earlier this year. This includes the unique miniaturized lightning seconds mechanism integrated into the tourbillon cage. While the overall design remains unchanged, it now boasts enhancements such as a blued seconds scale and blued steel hands, coupled with a case crafted entirely from white gold.
Initial Impressions
The Nano Foudroyante can be viewed as a stylistic adaptation of the original model, presenting a notably distinct visual appeal while maintaining a similar tactile experience. The watch feels substantial and high-quality, characterized by its weight and density. The incorporation of blue highlights and a faux-fabric rubber strap lends it a contemporary, relaxed aesthetic that is currently in vogue. In contrast, the original EWT version showcased a more traditional watchmaking complexity, featuring a monochrome grey-and-silver palette. Despite both versions sharing similar designs, a stronger differentiation could have been pursued by Greubel Forsey, or perhaps the EWT model could have embraced a more avant-garde approach, which aligns with the concept of an “experimental” limited edition. Nonetheless, the watch impressively showcases innovative techniques related to the foudroyante and chronograph, albeit it is regrettable that the foudroyante does not integrate with the chronograph function. The craftsmanship remains impeccable, reflecting the high standards associated with Greubel Forsey. The price point remains fixed at CHF465,000, which, while consistent with the brand’s pricing strategy, is considered substantial for a chronograph, even one as intricately designed as this.
The EWT Version: Transition to Mainstream
The new Nano Foudroyante mirrors the same case design as its predecessor, featuring compact dimensions of 37.9 mm in diameter and a height of 10.49 mm, making it the smallest wristwatch produced by Greubel Forsey to date. However, unlike the EWT version, which combined white gold with tantalum, the new model is crafted entirely from white gold. The dial retains the EWT aesthetic but now features blued steel hands and a blued-coated flange that displays the seconds scale around the dial’s perimeter. The term “Nano Foudroyante” denotes the miniature lightning seconds mechanism mounted on the tourbillon cage. This mechanism completes one full revolution per second, executing jumps in six imperceptible steps, exemplifying Greubel Forsey’s “nanomechanics,” which involve mechanisms that are minimized for energy efficiency. The foudroyante’s energy consumption is significantly reduced—by a factor of 1,800—compared to traditional lightning seconds mechanisms, allowing it to operate continuously without compromising the amplitude.
Chronograph Mechanics and Features
As Greubel Forsey’s first chronograph, the Nano Foudroyante separates the lightning seconds from the chronograph function. The foudroyante operates continuously, while the chronograph can be activated and halted in the conventional manner. The chronograph’s construction is innovative; it includes traditional elements such as a column wheel and vertical clutch, yet features a unique layout that conceals much of the mechanism. Among its patented designs is a complex brake system for the clutch. Visually, the movement maintains the hallmark Greubel Forsey aesthetic, with frosted bridges and wide, polished bevels, complemented by a selection of jewels set in gold chatons and a generous number of black polished steel components. A distinctive feature is one of the chronograph wheels, which showcases an extra-wide spoke adorned with the brand’s signature relief micro-engraving.
Specifications and Pricing
Greubel Forsey Nano Foudroyante
Diameter: 37.9 mm
Height: 10.49 mm
Material: White gold
Crystal: Sapphire
Water resistance: 30 m
Movement: In-house flyback chronograph movement with one-minute flying tourbillon
Functions: Hours, minutes, small seconds, flyback chronograph, foudroyante, and flying tourbillon
Winding: Manual winding
Frequency: 21,600 beats per hour (3 Hz)
Power reserve: 24 hours with the chronograph activated
Strap: Textured rubber strap with white gold buckle
Limited edition: 22 pieces
Availability: Available through Greubel Forsey and authorized retailers
Price: CHF465,000 before tax
