====== Greubel Forsey Double Tourbillon 30° Secret ======

{{wst>image_cr|Greubel Forsey|Double Tourbillon 30° Secret|270px}}

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

See:
  * [[Greubel Forsey Double Tourbillon 30°]]

Greubel Forsey's first invention, presented in [[2004]], was 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.

This model has, as the name already tells, a closed dial merely hinting at the sophisticated mechanism beneath.

<WRAP ud ud_mod>
**Reference:**
  * GF02j Secret, 2010

**Movement:**
  * [[Manual winding]] [[manufacture movement]], 21,600 A/h
  * 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:**
  * [[White gold]]
  * Ø 44.5 mm, H 16.11 mm
  * [[Sapphire crystal]] domed and transparent caseback
  * [[Waterproof]] to 3 bar

**Dial:**
  * Silvered gold

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


{{tag>Watch_models Watches_with_tourbillon Greubel_Forsey_models}}