Greubel Forsey is launching its Balancier Convexe S² and its Double Balancier Convexe with smaller titanium cases, with the former now 2mm smaller at 41.5mm across while latter model drops 1mm to now measure 42.5mm across.
The new sizes retain the watchmaker’s existing Balancier and Double Balancer movements and places each into a slightly slimmer Convexe titanium case.
Greubel Forsey’s Convexe collection is characterized by an undulating bezel, first presented in 2019, and a curved layout that dramatically displays the caliber’s open-worked gears, wheels and bridges.
The collection is meant to be this high-end maker’s contemporary ‘daily wear’ collection. You’ll see none of the Greubel Forsey foundational phrases engraved on the dial or bezel within this collection. And, with 100 meters of water resistance and fully integrated lugs, the watches fits snugly on the wrist for wearing comfort rain or shine.
The watchmaker says the new sizes retain the “harmony of their proportions and the architectural requirements of the movement.” Each model limited in production and only be available between 2023 and 2026.
Balancier Convexe S²
Notably, the new size of this model places the hour ring closer to the sapphire crystal while the remaining double open-worked arch bridge maintain’s the multi-dimensional architectural design of the original.
Look for the newest Balancier Convexe S² in either a grey or blue livery (two editions).
In the grey model, Greubel Forsey utilizes a wide range of finishes meant to magnify each chromatic variation. This is created using frosted plates and straight-grained and mirror-polished surfaces. Breaking the grey layout is a colorful power reserve featuring an arrow that points out the long seventy-two-hour reserve performance.
On the blue version, Greubel Forsey offers a lighter-hued mainplate, a dark blue hour-ring and raised luminescent hour-markers. These make the large balance and small seconds display at 8 o’clock stand out. 
Greubel Forsey will make eighty-eight pieces of each new 41.5 mm Balancier Convexe S² in titanium.
Double Balancier Convexe
For this model, Greubel Forsey has re-configured the case as well as the movement. The new 42.5mm case now slips more easily than its larger forebear under a fitted sleeve. It also displays a more natural titanium hue with a polished bezel with satin finishes, allowing for more dramatic light reflection, depending on the viewing angle. 
Flanking each corner are the watch’s namesake two balance wheels, each inclined at 30° and separated by a constant spherical differential between the 6 o’clock and 7 o’clock positions that ‘calculates’ their average timing rate. (See below for full specification details.) 
Within the bezel you’ll seem elements of contrasting light and shadow. For instance, the lettering on the barrel cover blends well with the case while the bridges of each balance wheel reveal the high level of hand-applied black polishing that characterizes Greubel Forsey movements.
Greubel Forsey offers the 42.5 mm Double Balancier Convexe with a grey rubber strap or on a beautifully integrated titanium bracelet.
Prices: Double Balancier Convexe: CHF 305,000 ($345,000).
Balancier Convexe S2: CHF 212,000 ($240,000).
Specifications: Greubel Forsey Balancier Convexe S2
Highlights: Hours and minutes, small seconds, power-reserve, 30° inclined Greubel Forsey balance wheel system.
Movement: Manual Wind with 72-hour power reserve, frequency of 21,600 vibrations/hour.
Barrels: Two coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension, relief-engraved text, circular-grained, black treatment.
Bridges and main plates: Titanium, frosted, polished beveling and countersinks, anthracite or blue treatment according to the version, multi-level, open-worked suspended-arch bridge, black treatment, straight-grained and polished, polished beveling and countersinks.
Movement side: Frosted bridges, polished edges and beveling, gold plate with engraved limitation number, circular- grained, polished beveling and countersinks, straight-grained flanks .
Escapement: Titanium inclined at a 30° angle with frosted, polished countersinks, large straight-grained inclined facet, multi-level, open-worked balance wheel bridge, straight-grained and polished, polished beveling and countersinks.
Case: 41.5mm by 12.48mm (14.80mm with sapphire crystal) titanium with curved synthetic sapphire crystal, three-dimensional, variable geometry-shaped bezel, hand-polished with hand-finished straight graining, profiled lugs, screwed fixing, transparent back with high domed synthetic sapphire crystal, titanium security screws, raised engraving “Balancier Incliné” and “Greubel Forsey.”
Dial: Three-dimensional, variable geometry hour-ring, polished, with engraved and lacquered minute-circle, three-dimensional, variable geometry hour indexes, polished, with Super-Luminova, power-reserve indicator, engraved and lacquered, gold small seconds dial with polished bevel.
Strap and clasp: Non-animal material, rubber with texture in relief, titanium folding clasp, engraved GF logo. Three-row metal bracelet in titanium, folding clasp with integrated fine adjustment, engraved GF logo on demand.
Price: CHF 212,000, or about $240,000.
Specifications: Greubel Forsey Double Balancier Convexe
Highlights: Double Balancier, hours and minutes, small seconds, 4-minutes spherical constant differential rotation, power-reserve display.
Movement: Hand-wound movement with 72-hour power reserve. Frequency of 21,600 vibrations/hour.
Bridges and main plates: Titanium with frosted, polished beveling and countersinks, grey treatment, multi-level, open-worked centre bridge, polished beveling and countersinks.
Movement side: Flat black polished steel differential bridge, gold plate with engraved limitation number, circular-grained, polished beveling and countersinks, straight-grained flanks.
Barrels: Two coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension, relief-engraved text, circular-grained, black treatment, polished chamfer.
Escapements: Inclined at a 30° angle, steel, straight graining, hand-polished beveling and countersinks, polished steel pillars, open-worked steel balance wheel bridges, hand-polished beveling and countersinks, flat black polished.
Case: 42.5mm by 14.35mm (with crystal) titanium with curved synthetic sapphire crystal, three-dimensional, variable geometry-shaped bezel, hand-polished with hand-finished straight graining, profiled lugs, screwed fixing, transparent back with curved synthetic sapphire crystal, titanium security screws, raised engraving “Double Balancier” and “Greubel Forsey.”
Dial: Three-dimensional, variable geometry hour-ring with engraved and lacquered minute-circle, three-dimensional, variable geometry hour indexes, polished, with Super-Luminova, power-reserve indicator, engraved and lacquered, differential rotation and small seconds indicators in gold. Power-reserve hands, 4-minutes and small seconds in polished steel, blued according to the version, flat black polished head.
Strap and clasp: Non-animal material, rubber with texture in relief, titanium folding clasp, engraved GF logo. Three-row metal bracelet in titanium, folding clasp with integrated fine adjustment, engraved GF logo on demand.
Price: CHF 305,000 ($345,000).
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