Greubel Forsey Tourbillon 24 Secondes Contemporain in Platinum

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 GreubelForsey.

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.

Technical details
Model: Greubel Forsey Tourbillon 24 Secondes Contemporain in Platinum
Unique edition of 33 pieces in platinum

Features
Tourbillon 24 Secondes
Power-reserve indicator
Hour and minute display
Small second display
24-second tourbillon rotation indicator

Movement
Mechanical hand-wound movement, Calibre GF01c
Movement with patented tourbillon
Diameter: 36.40 mm
Thickness: 10.90 mm

Number of parts
• Complete movement: 267 parts
• Tourbillon cage: 88 parts
• Weight of the cage: 0.39 g

Number of jewels
• 40
• Olived-domed jewels in gold chatons

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: Free sprung variable-inertia balance with gold mean-time screws (10 mm diameter)
Frequency: 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main Plates
Titanium, spotted, with polished bevelling, frosted, royal blue treatment

Bridges
• Nickel silver, frosted and spotted, nickel-palladium treatment with polished bevelling
• 1 gold plate engraved with the individual number
• 1 titanium plate engraved with the individual number
• Synthetic sapphire crystal tourbillon bridge

Gearing
• Involute circle profi le
• Tangential inclined gear with profiled teeth, on fixed wheel and escape wheel pinion

Tourbillon cage
• Inclined at a 25° angle, 24-second rotation
• Cage pillars in Avional
• Titanium cage bridges
• Gold counterweight

Displays
• Hour and minute
• Small second
• 72-hour power reserve on a sector
• 24-second tourbillon rotation indicator

Case
• Platinum 950 with convex synthetic sapphire crystal
• Transparent back with synthetic sapphire crystal
• Raised polished engraving “Tourbillon 24 Secondes Incliné” on a hand-punched background
• Three-dimensional, variable geometry-shaped lugs
• Gold security screws
• 2 platinum plates, engraved, hand-fi nished with texts, screwed to the caseband
• Unique edition of 33 pieces
• Diameter: 43.50 mm
• Thickness: 15.20 mm
Water-resistant: 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: In platinum with engraved and black lacquered GF logo

Dial
• Synthetic sapphire crystal hour-ringl
• Small second dial and power-reserve sector in gold

Hands
• Hour and minute in polished gold, with Super- LumiNova
• Small seconds (red triangle)
• Power-reserve in polished gold
• 24-second double-tipped hand, black anodised aluminium

Strap and clasp
• Hand-sewn dark blue alligator
• Platinum 950 folding clasp, hand-engraved with the Greubel Forsey logo

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