====== IWC 790 ======
{{wst>image_cr|IWC|Fliegeruhr Chrono-Automatic|IWC Pilot's Watch Chrono-Automatic, stainless steel}}

The **790** (and derivative **7901**, **7902**, **7912**, **7922**, **79320**, and **75320**) is an [[automatic chronograph]] movement produced by [[IWC]] based on the [[Valjoux 7750]] [[ebauche]] since [[1981]].

===== Details =====
The [[Valjoux 7750]] movement was extremely important to the resurgence of [[IWC]] and the basic design remains in use today. The company has used it for many important innovations since the 1980's, including a [[perpetual calendar]], [[rattrapante]], and [[grande complication]]. The 7750 [[ebauche]] was used for the [[IWC 7900|790 family of movements]] and the basic architecture is the basis for today's [[IWC 69000|69000 family of movements]].

The first use of a 7750 [[ebauche]] by [[IWC]] was the **Cal. 790** of [[1981]]. Produced for the [[Porsche Design]] [[chronograph]]s built by IWC, it was a basic [[Valjoux 7750]] with nickel plating by IWC. This movement was used through [[1988]].

**Cal. 7902** started with a basic Valjoux 7750 before being disassembled by IWC. The original components were refinished and gold plated, and the movement was assembled and regulated. This movement was produced from [[1988]] through [[1996]]. **Cal. 7901** is essentially the same, but with the day indication removed. It was produced from [[1991]] through [[1993]].

In [[1995]], IWC began changing the [[regulation]] system from the original Valjoux "fine regulator" to the [[Etachron]] system. This movement was renamed **Cal. 7912**. In [[1996]], IWC switched to the [[Triovis]] regulator, renaming the movement **Cal. 7922**.

The movement plating was switched to nickel in [[2005]], with the movement renamed **Cal. 79320**. The jewel count was also updated at this time to 31. IWC began sourcing [[ebauche]]s from [[Sellita]] in the 2010s. Although the specification remains the same, movements based on the Sellita [[SW 500]] are called **Cal. 75320**. Starting in [[2018]], IWC began using their own [[in-house]] [[IWC 69380|Cal. 69380]] in new watches like the [[IWC Pilot's Watch Chronograph Spitfire]]. It retains the 6-9-12 subdial layout but moves [[small seconds]] to the 6 00 position.

===== Movement Family =====
  * 790 (1981-1988) - Nickel-plated [[Valjoux 7750]]
  * 7901 (1991-1993) - Gold-plated [[Valjoux 7750]], date-only
  * 7902 (1988-1996) - Gold-plated [[Valjoux 7750]]
  * 7912 (1995-1996) - Gold-plated [[Valjoux 7750]] with [[Etachron]]
  * 7922 (1996-2005) - Gold-plated [[Valjoux 7750]] with [[Triovis]]
  * 79320 (2005-2010s) - Nickel-plated [[ETA 7750]] with 31 jewels
    * [[IWC Portofino Chronograph 3783]] (2007-2011)
    * [[IWC Portofino Chronograph 3910]] (2011-present)
    * [[IWC Pilot's Watch Chronograph 3717]] (2006-2012)
    * [[IWC Pilot's Watch Chronograph 3777]] (2012-present)
    * [[IWC Aquatimer Chronograph 3767]] (2009-2013)
    * [[IWC Aquatimer Chronograph 3768]] (2014-present)
  * 75320 (2010s-present) - Nickel-plated [[Sellita]] [[SW 500]] with 25 jewels


<WRAP ud ud_mov>

**Description:**
  * [[Automatic]] movement based on [[Valjoux 7750]]
  * Bi-directional winding

**Functions:**
  * Hours, minutes, [[small seconds]] at 9 00
  * [[Chronograph]] with hour counter at 6 00 and minute counter at 12 00
  * [[Day]] and [[date window]]s at 3 00

**Data:**
  * Ø 30 mm, 7.9 mm thick
  * 25 or 31 [[jewels]]
  * 28,800 A/h
  * [[Power reserve]] 44 hours

**Production period:**
  * [[1981]]-Present
  * Successor [[IWC 69380]]
</WRAP>

{{tag>Movements Valjoux_7750 Automatic_movements Automatic_chronograph_movements IWC_calibres}}