2013 Sihh New Product Preview – Greubel Forsey Quadruple Tourbillon

The sealed design basin of the Greubel Forsey Quadruple Tourbillon Secret hides a differential four-body tourbillon that moves like a ballet underneath, showing the elegance and unique personality of the watch.
 The sealed design basin of the Quadruple Tourbillon Secret hides the differential four-body tourbillon that moves like a ballet underneath, showing the elegance and unique personality of the watch. Behind the black gold face plate is a top-perfect hand-polished movement, which is connected to two sets of dual tourbillon systems by a spherical differential device, performing a miniature mechanical ballet. The small dial on the faceplate implies that the tourbillon underneath is turning, and the true tourbillon’s appearance can only be appreciated through the small window or case back on the side of the case.

 The hollow hour and minute hands, the GF logo, the 12-hour mark, the hour scale, and the small machine plate engraved with independent numbers are all made of 18K gold, which is in sharp contrast with the black gold dial, which is very eye-catching. The two small dials below conceal and also hint at two dual tourbillon systems, of which the small dial at 7 and 8 o’clock is the splint of the tourbillon system.
 The small seconds dial that is larger at 7 and 8 o’clock is a 240-second display, which means that the outer tourbillon frame of the dual tourbillon system rotates once every four minutes, while the small dial at 5 o’clock shows another dual tourbillon. A four-minute display of one revolution of the tourbillon frame outside the flywheel system. The two sets of dual tourbillon systems are connected in series by a high-performance spherical differential device, and the errors between the two sets of systems are balanced and adjusted. The small seconds and sector-shaped power reserve are displayed at 2 o’clock, which is visually balanced with the small dial at 7 o’clock.
The precise and clever design of the Quadruple Tourbillon Secret represents a special connection between collectors and watchmakers Robert Greubel and Stephen Forsey. This watch is extremely precious, with only limited editions of 8 pieces in 5N red gold and 8 pieces in platinum.
Technical Information
 The movement consists of 519 parts, of which 261 form a four-body tourbillon frame, and two barrels provide a 50-hour effective power reserve. Balance without balance spring, Philips winding spring and vibration frequency is 3Hz / 21,600 APH.
 The main board and plywood are made of nickel silver, nickel and palladium processing, decorated with drilling frosting and straight lines, and manually polished and chamfered. Black or silver gold dial with bar scales. The case is made of 950 platinum or 5N red gold, with a diameter of 43.5 mm and a thickness of 16.11 mm. The surface and back are made of asymmetric curved sapphire crystal glass. It comes with a hand-stitched black crocodile leather strap. The buckle is made of 950 platinum or 5N red gold.
Quadruple Tourbillon
 The Quadruple Tourbillon is the second basic invention of Coperfuss. It is equipped with a four tourbillon movement consisting of two 30-degree double-body tourbillons. Each tourbillon operates independently, and the two The device is connected in series by a sphere differential device to balance and adjust the error between the two systems. The inner tourbillon of the dual tourbillon device is inclined at 30 degrees, which can offset the effect of gravity on the mainspring and balance wheel, and improve the accuracy of travel time.
Spherical Differential
 Two sets of dual tourbillon devices and sphere differential devices are connected in series to balance and adjust the errors between the two sets of systems. Planar differential devices are usually used in general wristwatches and combined with power reserve displays, while spherical differential devices (such as those used in cars) are rare, due to their complex and sophisticated components that are difficult to manufacture.
Perfect craftsmanship and aesthetics
 Like all Gopherfuss watches, the quality of the manual polishing and decoration of the differential four-body tourbillon is beyond doubt. The components of the movement are carefully designed to show and display the most beautiful aspect of the movement. There are countless small but magnificent places for people to discover. The grinding process of the machine plate, the blackflat polishing technology of stainless steel, and the amazing human hand grinding chamfering and precise chamfering are not only the top technology that the machine, even the technicians with rich grinding experience cannot do, Create a humane watch, full of vitality and vitality. The gold sleeve is inlaid with a large domed olive-shaped bearing jewel, and even the fine screws are polished, which proves that this watch is of perfect quality everywhere.