Greubel Forsey continues to establish its new and assertive identity. The Double Balancier Convexe is its latest expression.
With every invention, Greubel Forsey has added a significant milestone to the history of watchmaking. The Double Balancier, patented in 2007, is one of them. It was first demonstrated in an EWT (Experimental Watch Technology) prototype, with two superimposed regulating organs inclined at 20°. A second iteration followed soon after, this time in a six piece unique edition with the two regulating organs positioned in different three-dimensional planes and inclined at 35°. Finally, in 2016, Greubel Forsey presented the invention in its current, double-patented form: the two balance wheels are dissociated, inclined at 30° and separated by a constant spherical differential which calculates their average timing rate.
Greubel Forsey unveils a new timepiece emphasising the architectural dimension of its 6th invention that is the Double Balancier. The three regulating organs (two balance wheels, one differential) occupy more than half of the dial and provide unprecedented depth. The timepiece is contrasting, highly technical and more contemporary than ever.
The timepiece gets its name from the convex profile of its 43.5mm titanium case. It’s plunging lines that hug the curve of the wrist raised significant technical challenges, requiring the sapphire crystal and above all the movement to adopt to this unique shape.
This new composition showcases its movement spectacularly. The gear train emerges from below the surface of the seemingly semicircular black-treated titanium bridge and extends into the hour and minute hands which tower above it. The semicircle itself is rendered asymmetrical by an opening for the barrel cover, central hours and minutes indication, and by an opening which provides space for the small seconds indication below it. The engraved and lacquered minute indexes are nested within the three-dimensional chapter ring, but the polished hour indexes surpass it, plunging deep into the movement.
Each hand has its own geometry, finish and color, depending on the role assigned to it. The hour and minute hands take on a curved profile and are filled with Super-Luminova, complementing that of the hour indexes. The small seconds and 4-minute hand indicating the rotational speed of the spherical differential are in polished blued steel while the power reserve is indicated by a polished and openworked hand with a red tip.
Every single component is hand finished to Greubel Forsey criteria and thus stands out on its own, and at the same time it contributes to the striking overall æsthetic of this timepiece. The bridges and mainplate of the Double Balancier Convexe are in frosted and black treated titanium. A new font has been adopted for the power reserve and different elements throughout this timepiece. On the barrel cover, we discover relief-engraved text, circular-grained with polished chamfer, describing the properties of the two coaxial barrels in series with rapid rotation (one revolution in 3.2 hours). They drive a 374-part movement, endowed with a 72-hour chronometric power reserve materialized by an openworked hand.
The Double Balancier Convexe, like most of the contemporary creations of the Atelier, is now water resistant to 100 meters – a detail that does not mislead on its vocation to be worn daily, in all circumstances.
Only 22 Double Balancier Convexe timepieces will be made per year between 2022 and 2024 for a total of 66 pieces overall.
Double Balancier Convexe
Hand-wound movement with 2 patents
Double Balancier • hours and minutes • small seconds • 4-minutes spherical constant differential rotation • power-reserve
NUMBER OF PARTS
• Movement: 374
NUMBER OF JEWELS
• Olived-domed jewels in gold chatons
CHRONOMETRIC POWER RESERVE
• 72 hours
• 21’600 vibrations/hour
• Double Balancier
• Hours and minutes
• Small seconds
• 4-minutes spherical constant differential rotation
• Titanium with curved synthetic sapphire crystal
• Three-dimensional, variable geometry-shaped bezel, hand-polished with hand-finished straight graining
• Raised engraving “Double Balancier” and “Greubel Forsey”
• Diameter: 43,50mm (caseband) and 46,50mm (bezel)
• Height: 13,75mm (case) and 14,35mm (synthetic sapphire crystals)
WATER RESISTANCE OF THE CASE
• Water-resistant 10atm – 100m – 328ft
• Three-dimensional, variable geometry hour-ring with engraved and lacquered minute-circle, black treatment
• Power-reserve indicator, engraved and lacquered
STRAP AND CLASP
• Non-animal material, rubber with texture in relief, titanium folding clasp, engraved GF logo
• On demand: 3-row metal bracelet in titanium, folding clasp with integrated fine adjustment, engraved GF logo
• 295’000 CHF for the Double Balancier Convexe on the ballistic strap
• 335’000 CHF for the Double Balancier Convexe on the titanium bracelet
For more information please visit Greubel Forsey