====== Greubel Forsey QP à Équation ======

{{wst>image_cr|Greubel Forsey|QP à Équation|300px}}
{{wst>image_cr|Greubel Forsey|QP à Équation White Gold|270px}}

The **QP à Équation** is a luxury wristwatch by [[Greubel Forsey]].

This model features a bidirectional [[perpetual calendar]] (day, date, month, calendar year, [[leap year]], [[day/night]]) and an [[equation of time]] with month, season, solstice and equinox.

It has a red gold case and a chocolate-coloured dial. The hand-wound movement is equipped with a Tourbillon 24 Secondes and has 4 patents.

The watch was launched in [[2014]] with [[white gold]] case and anthracite dial in a 5-pieces-edition, followed by a variant with rhodium-coloured gold dial in [[2017]]. In the same year the watch won the Calendar Watch Prize at the [[Grand Prix d'Horlogerie de Genève]].  A variant with [[red gold]] case was presented in [[2020]].

<WRAP ud ud_mod>
**Movement:**
  * [[Manual winding]] [[manufacture movement]], 21,600 A/h
  * [[Balance spring]] with [[Phillips terminal curve]]
  * [[Tourbillon]] inclined at a 25° angle, 24-seconds rotation
  * [[Double barrel]]
  * 75 [[jewels]]
  * Olived-domed jewels in gold [[chatons]]
  * 624 components
  * [[Power reserve]] 72 h

**Case:**
  * [[Red gold]] or [[white gold]]
  * Ø 43.5 mm, H 16.0 mm
  * [[Sapphire crystal]] domed and transparent caseback
  * [[Waterproof]] to 3 bar

**Dial:**
  * Anthracite / Chocolate-coloured / [[Rhodinated]] gold

**Functions:**
  * Hours, minutes, [[small seconds]]
  * [[Perpetual calendar]] (day, date, month, calendar year, [[leap year]], [[day/night]])
  * [[Equation of time]] with month, season, solstice and equinox
  * Function selector: perpetual calendar or H/M time adjustment
  * [[Power reserve indicator]] via circular arc

**Bracelet:**
  * Brown/black hand-sewn alligator strap with [[folding clasp]]
</WRAP>

{{tag>Watch_models Watches_with_perpetual_calendar Watches_with_equation_of_time Greubel_Forsey_models}}