The Greubel Forsey GMT Quadruple Tourbillon is now available in titanium. Released in a limited edition of 11 pieces, this groundbreaking horological marvel incorporates new materials, new colors and new finishes.
The Quadruple Tourbillon is Greubel Forsey’s second fundamental invention, which averages out the positional errors caused by gravity in all situations, especially in stable watch positions. To achieve this, the original tourbillon has been elevated to its full potential: inclined 30°, doubled and then quadrupled.
As a result, two synchronized double tourbillon 30° mechanisms, in which the first cage is inclined 30° and rotates in one minute, nested in the second horizontal cage, completes a full rotation in four minutes. The spherical differential transmits the average timing rate of the four tourbillon cages, improving the overall timing performance of all regulating mechanisms. Discount watches
The 46.5mm case of the GMT Quadruple Tourbillon is made of titanium, which is stronger and lighter than steel, while also being extremely resistant to corrosion and magnetic fields. This exclusive titanium limited edition comes with a striking blue accent, ensuring modernity and movement on the wrist.
Titanium’s toughness presents significant machining and hand-finishing challenges for components made from it, such as GMT pushers or folding clasps or crowns. In addition, new hand-finished details have been created especially for this watch.
For the first time, the circular grained hour circle with polished bevels and the 72-hour chronograph power reserve display is presented in bright blue. The motherboard is now matte with polished bevels, countersunk and straight grained sides, and comes in a grey finish.
Set near eight o’clock, the blue-painted rotating globe provides simultaneous display of several different time zones: on the dial side, with a 24-hour ring around the globe for day/night indication, on the case-back side, Displays the respective time zones of the 24 major cities, with a distinction between daylight saving time (on a light background) and no daylight saving time (on a dark background).
A sapphire crystal window around the equator completes the watch, offering a complete view of the Earth in motion, with its continents immersed in deep blue waters, complementing the power reserve, hour ring and the delicate blue finish of the strap.
technical details
Model: GMT Quadruple Tourbillon
Edition: 11 Titanium
move
Manual winding movement with 3 patents
Movement size
• Diameter: 39.50mm
• Thickness: 13.00mm
number of parts
• Movement: 705 parts
• Four tourbillon cages: 260 parts
• Total frame weight: 2.25 grams
• Spherical differential: 28 parts
number of jewels
• 84
• Olive Dome Jewelry in a Gold Sink
Chrono Power Reserve
• 72 hours
barrel
• Three fast-turning barrels in series (one revolution in 3.2 hours), one of which is fitted with a sliding spring to avoid excessive tension
balance wheel
• Variable inertia with platinum averaging time screw (10.70 mm diameter)
frequency
• 21,600 vibrations/hour
gossamer
• Phillips end curve
• Geneva Studs
motherboard
• Nickel silver, matte and speckled, polished beveled and countersunk, ruled sides, grey finish
bridge
• Nickel silver, matte and speckled, polished bevel and countersunk, ruled sides, grey finish
• Individual number engraved
Gold Plate • Black polished polished gold plate with embossed text, polished bevel and countersunk, ruled sides
•Four flat black polished steel tourbillon bridges, hand-polished chamfers and countersinks, ruled sides
Internal tourbillon
• Tilt 30°, 1 revolution per minute
External tourbillon
• 1 spin in 4 minutes
• Hand-chamfered and hollowed-out cage posts
• 1 gold weight per double cage, with individual number for the timepiece
gear drive
• Involute profile
• Bevel gears with profiled teeth
show
• Hours and minutes
• Small seconds (average performance)
• 72 hour power reserve sector
• Second time zone GMT
• World time in 24 time zones
• Spin titanium ball and world time
• City Watch Summer Time
• day and night
External
case
• Titanium with asymmetric convex synthetic sapphire crystal
• Transparent case back with asymmetrical cabochon synthetic sapphire crystal
Glass • Side window with profiled synthetic sapphire crystal
• 3D variable geometry lugs
• Raised polished engraved “GMT Quadruple” and “Greubel Forsey” hand-punched background
• Gold security screws
• Polished bezel, case with hand-polished straight grain
• Titanium GMT button with raised engraving on hand-punched background
• Engraved with My Number
case size
• Diameter: 46.50 mm
• Height: 17.45 mm
Water resistance of the casing
• Waterproof 3atm – 30m – 100ft (Standard NIHS 92-20/SN ISO 22810:2010)
Crown
• Titanium with engraved GF logo
dial
• Multi-layered gold, anthracite
• Gold hour ring and power reserve, round grain, polished bevel, blue finish
• Gold hour markers
• GMT Gold, hand-brushed
• Small seconds, circular grain
pointer
• Polished gold hour and minute hands with Super-LumiNova coating
• Small seconds in polished stainless steel with black finish
• Polished stainless steel power reserve, hand polished countersunk
• Second time zone GMT indicator, red
Strap and Buckle
• Rubber or hand-stitched alligator leather
• Titanium folding clasp with engraved GF logo