====== Greubel Forsey Quadruple Tourbillon Secret ======

{{wst>image_cr|Greubel Forsey|Quadruple Tourbillon Secret Platinum|270px}}
{{wst>image_cr|Greubel Forsey|Quadruple Tourbillon Secret Red Gold|270px}}

The **Quadruple Tourbillon Secret** is a wristwatch by [[Greubel Forsey]].

Variant of the model [[Greubel Forsey Quadruple Tourbillon|Quadruple Tourbillon]] with hidden quadruple [[tourbillon]], presented in [[2012]].

<WRAP ud ud_mod>
**Movement:**
  * [[Manual winding]] [[manufacture movement]], 21,600 A/h
  * Balance spring with [[Phillips terminal curve]]
  * Four independant [[tourbillon]]s in two double cages
    * Inner tourbillons inclined at a 30° angle, 1 rotation per minute
    * Outer tourbillons 1 rotation in 4 minutes 
  * [[Double barrel]]
  * 63 [[jewels]]
  * Olived-domed jewels in gold [[chatons]]
  * 509 components
  * [[Power reserve]] 50 h

**Case:**
  * [[Red gold]] or [[platinum]]
  * Ø 43.5 mm, H 16.11 mm
  * [[Sapphire crystal]], domed, and transparent asymmetrical caseback
  * Lateral window with shaped sapphire crystal
  * Relief engraving of the name of the invention on the manually hammered caseback
  * [[Waterproof]] to 3 atm

**Dial:**
  * Gold multi-level either black (red gold version) or silvered (platinum version)
  * Gold hour markers
  * Gold display sectors

**Functions:**
  * Hours, minutes
  * Two inner minute tourbillons, 30° inclined, two outer tourbillons with 4 minutes circulation time, hour and minutes, small seconds and [[power reserve indicator]] via arc

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

**Limitation:**
  * 8 pieces in red gold and 8 pieces in platinum
</WRAP>


{{tag>Watch_models Watches_with_tourbillon Greubel_Forsey_models}}