Hand Made 1
While the vast majority of modern wristwatches are made using large scale industrial techniques and machinery, 95% of Greubel Forsey's Hand Made 1 – including the hairspring – is made using only hand-operated tools. Each watch takes approximately 6,000 hours (around three years of person hours) to make.[10] [11] Hand Made 1 was awarded the prize for best Men’s Complication Watch at the 2020 Grand Prix d'Horlogerie de Genève.[12]
GMT/GMT Sport
Presented in 2011, the GMT is the first Greubel Forsey timepiece to feature a complication other than a tourbillon. It displays a second time zone at 10 o’clock and the world by a rotating, three-dimensional globe at 8 o’clock. The position of the continents on the titanium globe are cross-referenced with the 24-hour chapter ring circling it for an approximate indication of time all over the world. Other indications include an hour-minute dial at 1 o’clock, a small seconds dial on top of that at 3 o’clock and at 4 o’clock a sectorial power reserve indicator. The movement was especially developed for this timepiece and features the 25° inclined Tourbillon 24 Secondes cage. Since it was first launched, the GMT has been released in rose gold, white gold, and in platinum. [13] [14] [15]
QP à Équation
The QP à Équation is a perpetual calendar displaying day, date, month, calendar year, leap year, day/night, equation of time with month, season, solstice and equinox, hours, minutes, small seconds and power-reserve. It has a function selector and regulated by a 24-second tourbillon.[16]
Quadruple Tourbillon
The Quadruple Tourbillon uses two double-tourbillons (four tourbillon cages in total) working independently to average out and minimize gravitationally induced errors on the balance. A spherical differential connects the four rotating carriages, distributing torque between two wheels rotating at different speeds.[17]
Grande Sonnerie
The Petite and Grande Sonnerie is a striking watch featuring a minute repeater activated by a crown pusher and a grande and petite sonnerie. As well as chiming the time, it displays hours, minutes, small seconds, a movement power reserve indicator and a striking power reserve indicator. It is regulated by a 24-second tourbillon.[18] With its 935 components, the Grande Sonnerie is Greubel Forsey’s most complex watch to date, requiring 11 years of research and development.[19]
Signature 1
The Signature line of watches are developed by one watchmaker who creates their timepiece with the aid, and to the quality standards, of Greubel Forsey.
Signature 1
Signature 1 is by Greubel Forsey watchmaker Didier J. G. Cretin. It displays hours, minutes and small seconds, and features a proprietary Greubel Forsey regulator.[20]
Invention Pieces
Invention Pieces showcase the important invention/mechanism in the movement rather than simply indicating the time.
Invention Piece 1 (IP1) 2007
Invention Piece 1 features the Double Tourbillon 30° mechanism with a new movement architecture. Red and blue triangles indicate the time under a large polished tourbillon bridge, with a small seconds dial and a ‘power reserve indicator’ above.
Invention Piece 2 (IP2) 2011
The Quadruple Tourbillon mechanism is at the heart of Invention Piece 2. The two double tourbillon systems are configured head-to-tail and are coupled by a spherical differential. A sub-dial at 5 o’clock features a red triangle indicating hours while a concentrically-configured rotating disc indicates minutes. Small seconds are at 10 o'clock and there is a power reserve indicator at 11 o'clock.
Invention Piece 3 (IP3) 2009
The Tourbillon 24 Secondes is the mechanism highlighted by Invention Piece 3. A large 24-hour sub-dial dominates the dial side, with hours indicated by a red triangle. A smaller blue triangle indicates minutes. Small seconds are at 5 o’clock. Opposite the tourbillon at 8 o’clock lies a power reserve at 2 o’clock. Four gold dial plates on the dial are engraved with a message in French from Robert Greubel and Stephen Forsey.
Invention Piece 1 (IP1) 2007
Invention Piece 1 features the Double Tourbillon 30° mechanism with a new movement architecture. Red and blue triangles indicate the time under a large polished tourbillon bridge, with a small seconds dial and a ‘power reserve indicator’ above.
Invention Piece 2 (IP2) 2011
The Quadruple Tourbillon mechanism is at the heart of Invention Piece 2. The two double tourbillon systems are configured head-to-tail and are coupled by a spherical differential. A sub-dial at 5 o’clock features a red triangle indicating hours while a concentrically-configured rotating disc indicates minutes. Small seconds are at 10 o'clock and there is a power reserve indicator at 11 o'clock.
Invention Piece 3 (IP3) 2009
The Tourbillon 24 Secondes is the mechanism highlighted by Invention Piece 3. A large 24-hour sub-dial dominates the dial side, with hours indicated by a red triangle. A smaller blue triangle indicates minutes. Small seconds are at 5 o’clock. Opposite the tourbillon at 8 o’clock lies a power reserve at 2 o’clock. Four gold dial plates on the dial are engraved with a message in French from Robert Greubel and Stephen Forsey.
Double Tourbillon 30°
The Double Tourbillon 30° (DT30°) Vision/Secret The DT30° was presented in 2004 and features one 30° inclined tourbillon cage rotating once per minute inside another tourbillon cage rotating in four minutes, with the aim of averaging out and minimizing gravitationally induced errors on the balance.
Double Tourbillon 30° Technique
The Double Tourbillon 30° Technique is designed to highlight Greubel Forsey first invention, the double tourbillon 30° by highlighting the regulator.
Art Pieces
Art Pieces highlight the convergence of watchmaking and art, with the emphasis on the art rather than displaying the time. [21] Art Piece 1 is a collaboration between Greubel Forsey and British micro-sculptor Willard Wigan. Art Piece 1[22] features integrated magnifying optics on the side of the case to enable the Willard Wigan micro-sculpture to be viewed.
