Review: Complications and more complications: Greubel Forsey GMT Quadruple Tourbillon

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Greubel Forsey adds a Quadruple Tourbillon to their popular GMT model, turning it into a complication monster We get up close to this new beast, and discover its intimate charms

We covered the details on the Press Release published just before Baselworld 2019.

Click here for the details We also carried live photographs on our Live from Baselworld 2019: Greubel Forsey report Here is our detailed review with high resolution photographs

The new Greubel Forsey GMT Quadruple Tourbillon

Greubel Forsey GMT Quadruple Tourbillon

We covered the Greubel Forsey GMT models in various editions over the course of its history since the inception in 2011 (our coverage is from SIHH 2012).

And in a bit of detail in our manufacture tour where among other things, we also featured the GMT in 2014, The Quadruple Tourbillon was first introduced in 2008, and a new version was introduced in SIHH 2011, which we reported here This new version is used as the base for the GMT Quadruple Tourbillon

The first version of the GMT Earth (with special inscription on the bezel in micro-writing) taken off the wrist of Stephen Forsey, placed next to the new GMT Quadruple Tourbillon

This new release is a complication upon a complication: merging the already very complicated quadruple tourbillon to the almost equally complicated GMT.

What do we call such a collision of complications? A Mega Complicated Watch?

The case, dial and hands

The starting point is the movement used in the 2011 Quadruple Tourbillon This in itself was a slight modification to the original quadruple tourbillon introduced as the Invention Piece no2 And the marriage to the GMT which incidentally was also announced in 2011.

The case remains the rather large, bulbous one retained from the 2011 Invention Piece

The case bulges to accommodate the rotating sphere representing the globe at 8 But the case is neither awkward nor in-elegant.

This case shape was also adopted in the 2014 GMT Indeed, it manages to remain composed Though stealthy it is not.

With a design shape which is so unusual, and at a sizable 46.5mm diameter and 17.45mm thick, it is going to have a massive wrist presence.

The case shape is a rather bulbous one with great wrist presence, and a bump at 8 to accommodate the globe A piece of sapphire glass allows the globe to be observed from the case side.

And the twin double tourbillons are rotated from 1 and 8 in the Invention Piece to 11 and 5 in the 2014 version The space vacated by one of the double tourbillons in the Invention Piece is taken by the miniature 3 dimensional, rotating ball representing the Earth.

Each set of tourbillons comprise of twin axis tourbillon The inner one is at a 30° angle, 1 rotation per minute, and the outer one makes 1 rotation every 4 minutes The two double tourbillons are connected via a system of differential conical gearing and are fed power from a single triple barrel mainspring set.

Three series-coupled fast-rotating barrels make 1 []

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