====== Greubel Forsey Double Tourbillon 30° ======
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{{wst>image_cr|Greubel Forsey|Double Tourbillon 30° Technical Red Gold|270px}}

**Double Tourbillon 30º** is a luxury wristwatch by [[Greubel Forsey]].

Greubel Forsey's first invention, presented in [[2004]], is an innovative double [[tourbillon]] mechanism (DT30), with one tourbillon - inclined at 30° and rotating in 60 seconds - inside another rotating every four minutes, to average out gravity-induced errors on the oscillator.

The //DT30° Vision// focuses on the visibility of the innovative invention, while the //DT30° Secret// has a closed dial merely hinting at the splendid treasure beneath.

The Double Tourbillon 30° system also lies at the heart of [[Greubel Forsey Invention Pièce 1|Invention Pièce 1]], although the displays, surfaces, architecture and aesthetics have all been profoundly developed in creating this exceptional timepiece.

[[Greubel Forsey]] won the Complicated Watch Prize at the [[Grand Prix d'Horlogerie de Genève]] for the Double Tourbillon 30º Technique in November, [[2009]] and the "Aiguille d'Or" Grand Prix for the Double Tourbillon 30° Edition Historique in November, [[2010]].

//(GF press text)//

===== Models =====
  * Double Tourbillon 30° Vision
  * [[Greubel Forsey Double Tourbillon 30° Edition Historique|Double Tourbillon 30° Edition Historique]]
  * [[Greubel Forsey Double Tourbillon 30° Secret|Double Tourbillon 30° Secret]]
  * [[Greubel Forsey Double Tourbillon 30° Asymetrique|Double Tourbillon 30° Asymétrique]]
  * [[Greubel Forsey Double Tourbillon 30° Technique|Double Tourbillon 30° Technique]]

<WRAP ud ud_mod>
**Reference:**
  * GF02 Vision
  * GF02e Édition Historique([[2010]])
  * GF02j Secret ([[2010]])
  * GF02e2 Asymétrique ([[2017]])
  * GF02s Technique ([[2014]])

**Movement:**
  * [[Manual winding]] [[manufacture movement]], 21,600 A/h
  * [[Balance spring]] with [[Phillips terminal curve]]
  * Two [[tourbillon]]s, the inner inclined 30°, with circulation time 1 minute, the outer with circulation time 4 minutes
  * [[Double barrel]]
  * [[Power reserve]] 72 h

**Case:**
  * [[Red gold]], [[white gold]] or [[platinum]]
  * Ø 44.5 mm, H 16.11 mm
  * [[Sapphire crystal]] domed and transparent caseback
  * [[Waterproof]] to 3 bar

**Dial:**
  * Blackgold or silver

**Functions:**
  * Hours, minutes, [[small seconds]]
  * [[Power reserve indicator]] via circular arc

**Bracelet:**
  * Black hand-sewn Alligator strap with [[folding clasp]]

**Limitation:**
  * Models Single Edition 11 pieces each
</WRAP>

{{tag>Watch_models Watches_with_tourbillon Greubel_Forsey_models}}