====== Greubel Forsey Double Balancier ======
{{wst>image_cr|Greubel Forsey|Double Balancier|300px}}

**Double Balancier** is a luxury wristwatch by [[Greubel Forsey]].

The special feature of this watch is the double balance (//double balancier//): two oscillating systems coupled via a [[differential]], which contribute to an additional improvement of the [[rate]] precision. This invention was patented by Greubel Forsey.

<WRAP ud ud_mod>
**Movement:**
  * [[Manual winding]] [[manufacture movement]], 21.600 A/h
  * Two Greubel Forsey [[balance]], inclined by 30°
  * Balance springs: [[Phillips terminal curve]], Geneva-style stud
  * [[Double barrel]]
  * Main plate: Nickel silver, frosted and spotted, with polished bevelling and countersinks, straight-grained flanks, grey treatment
  * Bridges: Nickel silver, spotted, with polished bevelling and countersinks, straight-grained flanks, grey treatment
  * Flat black polished steel differential bridges
  * Flat black polished gold centre bridge, with polished bevelling and countersinks, straight-grained flanks
  * 2 engraved gold plates (1x Greubel Forsey, 1x individual number)
  * Escapement platforms inclined at a 30° angle, Nickel silver, straight graining, hand-polished bevelling and countersinks, nickel-palladium treatment
  * 50 [[jewels]]
  * Olived-domed [[jewels]] in gold [[chaton]]s
  * 285 components
  * [[Power reserve]] 72 h

**Case:**
  * 18ct [[red gold]]
  * Ø 43.0 mm, H 13.38 mm
  * Convex [[sapphire crystal]], caseback with [[sapphire crystal]]	 
  * [[Waterproof]] to 3 atm

**Dial:**
  * Multi-level black anthracite gold dial
  * Engraved and “oven fired” [[enamelled]] indexes (émail [[grand feu]] champlevé)
  * Differential rotation and small seconds indicators in gold
  * Hours and minutes hands in polished gold, with Super-LumiNova
  * Small seconds and 4-minutes hands in polished blued steel
  * Power-reserve hand in polished gold

**Functions:**
  * Hours, minutes, [[small seconds]]
  * Indication of the differential
  * [[Power reserve indicator]] at 2 00

**Bracelet:**
  * Hand-sewn alligator leather strap with [[folding clasp]]

**Limited edition:**
  * 51 pieces (2016-2021)
</WRAP>

{{tag>Watch_models Greubel_Forsey_models}}