Greubel Forsey presents the Tourbillon 24 Secondes Contemporain – a unique edition of 33 pieces featuring a titanium movement and 5N red gold case, which follows on from the early‐2012 launch of the Tourbillon 24 Secondes Contemporain in platinum.
Like its predecessor, this timepiece is part of the Greubel Forsey’s ‘Contemporain’ line, characterised by a round case and an architecture that allows the viewer to fully appreciate the micro‐mechanics, specifically Greubel Forsey’s third invention, the Tourbillon 24 Secondes mechanism. This calibre has been entirely re‐designed from scratch to provide a three‐dimensional view within a circular backdrop. The depth is accentuated by the royal blue finish of the mainplate and bridges and was achieved thanks to a special treatment developed by Greubel Forsey.
A quest for multi‐dimensional harmony guided Robert Greubel and Stephen Forsey’s architectural and technological creativity. This quest can be seen in the meticulous configuration of components within the spatial parameters, including the transparent synthetic sapphire tourbillon bridge providing a captivating and hypnotic impression of the regulator floating in mid‐air and the metalised hour indexes around the chapter ring.
The Tourbillon 24 Secondes Contemporain is distinguished by the magical royal blue finish of the titanium movement. This exceptional colour contrasts beautifully with the red gold of the case, and hands, while reinforcing the three‐dimensionality of the architecture.
The purity of this intense blue finish was achieved through a special oxidation process and is the fruit of considerable research and testing. Shimmering in an infinite range of hues according to the light, the special blue provides the timepiece with an unparalleled vivacity.
This timepiece houses Greubel Forsey’s third fundamental invention, the Tourbillon 24 Secondes, a highly efficient fast‐rotating – 24‐second revolution – tourbillon cage inclined at 25°, which minimises negative effects of gravity on the oscillator, particularly in stable positions.
The movement comprises 267 components, 88 for the ultra‐light 0.39 gram tourbillon cage and is powered by two coaxial mainspring barrels in series providing a power reserve of 72 hours. The oscillator features a variable inertia balance with Phillips terminal curve beating at 3Hz / 21,600 vibrations per hour. The titanium plate and bridges feature a royal blue oxide treatment and are hand finished with straight graining and spotting.
Bridges in nickel silver with nickel‐palladium finish are frosted and straight‐grained with hand polished bevels. The tourbillion bridge is transparent synthetic sapphire while the tourbillon cage is in titanium. The hour and minute chapter ring is in synthetic sapphire while small seconds dial and power reserve indicator are in gold. The 5N red gold case measures 43.5mm in diameter by 15.2mm high and features domed synthetic sapphire crystals on the dial side and display back. The blue alligator strap is hand‐stitched with a 5N red gold folding clasp.
Model: Tourbillon 24 Secondes Contemporain
Unique Edition – Royal blue movement
33 pieces in 5N red gold
Hand-wound movement with patented tourbillon
Tourbillon 24 Secondes • hours and minutes • small seconds • 24-seconds tourbillon rotation • power-reserve
Diameter: 36.40 mm
Thickness: 10.85 mm
Number of parts
• Movement: 365 parts
• Tourbillon cage: 88 parts
• Weight of the cage: 0.38 g
Number of jewels: 40; Olived-domed jewels in gold chatons
Chronometric power reserve: 72 hours
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
Balance wheel: Variable-inertia with gold mean-time screws (10 mm diameter)
Frequency: 21’600 vibrations/hour
Balance spring: Phillips terminal curve; Geneva-style stud
Main plates: Titanium, frosted and spotted, with polished bevelling, royal blue treatment
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• 1 gold plate engraved with the individual number
• Synthetic sapphire tourbillon bridge
• Inclined at a 25° angle, 24-seconds rotation
• Light alloy cage pillars
• Titanium cage bridges
• Gold counterweight
• Involute circle profile
• Tangential inclined gear on fixed wheel and profiled teeth on escape wheel pinion
Hours and minutes
72-hours power reserve on a sector
24-seconds tourbillon rotation
In 18k 5N red gold or platinum 950 with convex synthetic sapphire crystal
Diameter: 44.50 mm
Thickness: 15.20 mm
Transparent back with synthetic sapphire crystal
Three-dimensional, variable geometry-shaped lugs, screwed fixing
Raised polished engraving “Tourbillon 24″ Incliné” and “Greubel Forsey” on a hand-punched background
Gold security screws
Hand-polished bezel, caseband with hand-finished straight graining
Two 18k 5N red gold or platinum plates, engraved, hand-finished with text, screwed to the caseband
Hand-engraved individual number
Water-resistant: 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: In 18k 5N red gold or in platinum 950 with engraved and black-lacquered GF logo
Multi-level synthetic sapphire hour-ring, galvanic growth hour indexes with Super-LumiNova, engraved and lacquered minute-circle
Gold “12” index with Super-LumiNova
Tourbillon rotation, small seconds and power-reserve indicators in gold
Hours and minutes in polished gold, with Super-LumiNova
Small seconds (red triangle)
Power-reserve in polished gold
24-seconds double-tipped hand, black anodised aluminium
Strap and clasp
18k 5N red gold or platinum 950 folding clasp, hand-engraved with the GF logo