====== IWC 79251 ======
The **79251** (and derivative **79252**) is an [[automatic chronograph]] [[rattrapante]] [[perpetual calendar]] movement produced by [[IWC]] based on the [[Valjoux 7750]] [[ebauche]] from [[1995]] until [[2005]].

===== 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]].

In [[1985]], IWC surprised the world with the introduction of an innovative [[perpetual calendar]] movement, [[IWC 7906|Cal. 7906]]. Designed by the legendary [[Kurt Klaus]], this movement was much simpler to operate than previous perpetual calendars and was reliable and relatively affordable as well. A [[minute repeater]] variant, [[IWC 79091|Cal. 79091]] was introduced in [[1991]] for the [[IWC Grande Complication 3770|Grande Complication, Ref. 3770]]. In [[1993]], IWC's [[Richard Habring]] created a [[rattrapante]] complication for the 7750 base, [[IWC 79030|Cal. 79030]]. Two years later, on the 10th anniversary of the original Klaus perpetual calendar, these complications were combined in one movement, this **Cal. 79251**.

Cal. 79251 began with a [[Valjoux 7750]] [[ebauche]] before being disassembled and modified by IWC. The movement was refinished and plated with gold, then assembled and regulated by the company. It was used in the [[IWC Da Vinci Perpetual Rattrapante|Da Vinci Perpetual Rattrapante, Ref. 3751]] from [[1995]] through [[2001]].

A derivative movement, **Cal. 79252** was similar but used a different setting lever. It was used in the larger [[IWC Da Vinci Perpetual Rattrapante|Da Vinci Perpetual Rattrapante, Ref. 3754]], from [[2001]] through [[2005]].

===== Movement Family =====
  * 79251 (1995-2001) - [[Automatic chronograph]] [[rattrapante]] [[perpetual calendar]]
  * 79252 (2001-2005) - Modified setting lever

===== Applications =====
  * [[IWC Da Vinci Perpetual Calendar Rattrapante 3751]] (1995-2001)
  * [[IWC Da Vinci Perpetual Calendar Rattrapante 3754]] (2001-2005)


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**Description:**
  * [[Automatic chronograph]] [[rattrapante]] [[perpetual calendar]] movement based on [[Valjoux 7750]]
  * Bi-directional winding

**Functions:**
  * Hours, minutes, [[rattrapante]] [[chronograph seconds]] central
  * [[Date by pointer]] at 3 00
  * [[Month by pointer]] and [[chronograph hours]] at 6 00
  * [[Year window]] at 7 30
  * [[Day by pointer]] and [[small seconds]] at 9 00
  * [[Chronograph minutes]] and [[moon phase indicator]] at 12 00

**Data:**
  * Ø 30 mm
  * 43 [[jewels]]
  * 21,600 A/h
  * [[Power reserve]] 44 hours

**Production period:**
  * [[1995]]-[[2005]]
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{{tag>Movements Valjoux_7750 Automatic_movements Automatic_chronograph_movements Rattrapante_chronograph_movements Perpetual_calendar_movements IWC_calibres}}