The new Greubel Forsey Convexe timepiece emphasizes the architectural dimension of the iconic Swiss brand’s 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 Double Balancier Convexe gets its name from the convex profile of its 43.5mm diameter titanium case. 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 open-worked hand with a red tip.
In the lower half of the Greubel Forsey Double Balancier Convexe, each regulating organ is sculpted individually. The two balance wheels, although identical in shape and function, occupy different planes and thus offer a complementary spectacle.
The center bridge is in itself a showcase of the creative excellence of Greubel Forsey: multi-level, open-worked and black polished with several interior angles; it carries the hour and minute hands above the movement.
The inclined escapement platforms are straight-grained with hand- polished beveling and countersinks, while the differential bridge and balance wheel bridges are flat black polished with further hand-polished beveling.
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 aesthetic 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.
The barrel cover features 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). The movement offers a 72-hour chronometric power reserve.
The integrated and profiled lugs reinforce the compact and ergonomic character of this timepiece. They extend onto either a textured rubber strap or titanium bracelet.
The Double Balancier Convexe is water resistant to 100 meters. Only 22 timepieces will be made per year between 2022 and 2024 for a total of 66 pieces overall.
Technical details
Model: Greubel Forsey Double Balancier Convexe in titanium
Movement
Hand-wound movement with 2 patents
Double Balancier
Hours and minutes
Small seconds
4-minutes spherical constant differential rotation
Power-reserve display
Number of parts: 374
Number of jewels: 50; Olived-domed jewels in gold chatons
Power reserve: 72 hours
Frequency: 21’600 vibrations/hour
Case
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: 10atm – 100m – 328ft
Dial
Three-dimensional, variable geometry hour-ring with engraved and lacquered minute-circle, black treatment
Power-reserve indicator, engraved and lacquered
Strap
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
