====== Valjoux 7750 ======
{{wst>image_r|Breitling_Chronomat_Evolution|Breitling Chronomat Evolution with the 7750's familiar 6:9:12 subdial layout}}
{{wst>image_r|Valjoux_7750_Werkansicht|Valjoux 7750\\ [[Breitling Chronomat Evolution]], [[COSC]] certified}}
{{wst>image_r|Sinn_6000_Roségold_RS|[[Sinn 6000 Roségold]] with refined Valjoux 7750}}
The **Valjoux 7750** is a well-known and widely-used [[chronograph]] movement produced by [[Valjoux]] (part of [[ETA]] in the [[Swatch Group]]).

===== History =====
The 7750 is derived from the manually-wound [[Valjoux 7733]] chronograph movement, itself a descendent of the [[Venus 188]], a company Valjoux purchased in 1966. It was designed (partially on computer, an industry first) by [[Edmond Capt]].

Introduced on July 1, [[1974]], at the height of the [[quartz crisis]], the 7750 was released five years after the race to build an automatic chronograph was won by [[Zenith]]'s [[El Primero]] and the [[Chronomatic]] consortium. It sold well initially (estimated at 100,000 pieces in 1974) but was doomed the very next year. Production stopped in 1975 but demand was so low that supplies lasted into the 1980's. Local management retained the dies and equipment, allowing them to restart production in 1985 as demand for automatic watches rebounded.

Thanks to a durable and inexpensive design and strong support from [[Swatch Group]], the 7750 has become the most common Swiss automatic chronograph movement. Since the takeover of [[Valjoux]] by [[ETA]] the movement is also called **ETA 7750**.

This calibre is still produced and is probably the most successful [[automatic]] [[chronograph]] movement of all times. It serves as basis for several superstructures or modules, including many from other manufacturers. Due to its accuracy and robustness it can also be certified as [[chronometer]]. So the manufacturer [[Breitling]], for example, sends all of its watches, including numerous models with the Valjoux 7750 to the [[COSC]] certification.

These movements are currently referred to as "ETA 7750" or "Valjoux 7750", but ETA officially calls them "7750 Valjoux" to differentiate them from the [[Valgranges]] line. [[As of 2019]], ETA produces the 7750, 7751, 7753, and 7754 as well as the derived [[ETA A05]] line for [[Tissot]] and [[Rado]] and the larger [[Valgranges A07]] line.

===== Features =====
The 7750 is a [[self-winding]] [[chronograph]] movement with 25 [[jewels]], ball-bearing [[rotor]], unidirectional winding, 1/8-seconds counter, 30-minutes counter, 12-hours counter, 28.800 A/h, power reserve ca. 44 hours.

The key distinguishing features of the 7750 family are as follows 

  * Subdials at 6 00, 9 00, and 12 00 for hours, running seconds, and 30 minute chronograph counter, respectively
  * Conventional integrated center-mounted [[automatic]] winding in one direction (unlike the [[barrel]]-wound [[Chronomatic]])
  * Cam-controlled [[chronograph]] functions using a "heart piece" (unlike the more complex [[column wheel|column or pillar wheel]] style)
  * Simple three-plate [[brass]] base (rather than complex [[bridge]]s)
    * Calendar plate with modular components
    * Main plate with off-center [[center wheel]], [[hacking]] lever, and simple bent-spring ratchet
    * Top plate with additional winding bridge
  * [[Etachron]] regulator and balance spring stud

The initial 7750 movement used 17 jewels, but current versions of the 7750 have 24 or 25. It has been supplied at both 21,600 or 28,800 beats per hour, though the latter is much more common.

ETA produces 7750 movements in three finishes 

  - Elaboré
  - Top
  - Chronomètre

{{wst>template_valjoux_7750_calibres}}

===== Movement family =====
  * Valjoux 7750 (1973-present)
    * [[Valjoux 7750-P1]], without chronograph module
    * [[Valjoux 7751]] (1986-present), full calendar with [[hands date]], [[moon phase]], 24-hours indication
    * [[Valjoux 7753]] (2002-present), minute counter at the 3 instead of the 12, date change by pushers at the 10
    * [[Valjoux 7754]] (2003-present), 24-hours indication
    * [[Valjoux 7757]] (1985-2003), regatta-[[countdown]] indication
    * [[Valjoux 7758]] or [[Valjoux 7750 CCL]] (1985-2003), [[Moon phase]] (Valjoux 7750 CCL - "con cours de lune")
    * [[Valjoux 7760]] (1985-2005), [[Manual winding]]
      * [[Valjoux 7761]] (1986-1998), [[Manual winding]], without hours and day counter
      * [[Valjoux 7765]] (1983-1998), [[Manual winding]], 30-minutes counter at the 12, date indication
      * [[Valjoux 7768]] (1985-1998), [[Manual winding]], [[moon phase]], without hours and day counter
    * [[Valjoux 7770]] (2002-), [[Automatic]], [[rattrapante]]
    * [[Valgranges A07]], 16.5 ligne variant
    * [[ETA A05]], [[Rado]]/[[Tissot]] variant
  * Ebauches
    * [[Alpina]] AL-725 - with seconds counter removed for a [[bi-compax]] design
    * [[Alfred Rochat]], [[Chronoswiss]] (C. 732 or C. 741, C 741 by Rochat)
    * [[Ball Watch Company|Ball]] RR1104, RR1105 (7754), [[RR1301]], [[RR1401]], RR1402, [[RR1403]] (7751), RR1404, [[RR1405]]
    * [[Bremont]] [[BE-50AE]]
    * [[Damasko]] (fitting a Si main spring to the 7750)
    * [[Fortis]], developed by Paul Gerber featuring an alarm and two springs
    * [[Franck Muller]] FM 7850 CC MB
    * [[IWC]] Cal. 7922, 79320
    * [[Jacques Etoile]] (cal. IV.C4)
    * [[La Joux-Perret]] (for [[Jaquet Droz]] watches for example)
    * [[Omega]] 1155 (17 jewels), 1152/1154/1156/1158/1164 (25 jewels)
    * [[Paul Picot]] "Atelier Technikum"
    * [[Panerai]]
    * [[Porsche Design]] ([[Eterna 6036]])
    * [[Revue-Thommen]] ("Airspeed Flyback")
    * [[Sinn]] ("Flyback")
    * [[Soprod]]
    * [[TAG Heuer Calibre 16]]
  * Clones
    * [[Sellita SW500]]
    * [[Shanghai 3LZF2]]
  * Column wheel variants
    * [[Panerai]] [[Panerai OP XVIII|OP XVIII]] by [[La Joux-Perret]] (with [[rattrapante]])
    * [[Hublot]] [[HUB 44]] aka [[La Joux-Perret]] Cal. 8144 (only later versions have a column wheel)
    * [[Chronoswiss]] [[C.732]] by [[Alfred Rochat]] (with [[rattrapante]])
    * [[Graham]] [[G 1742]] by [[La Joux-Perret]] ([[monopusher]])
    * [[Vulcain]] [[V-50]] by [[La Joux-Perret]] 
    * [[ETA A08.L01|ETA A08.L01/A08.231]] for Longines (Cal. 688, 788)
    * [[Omega 3330]] by [[ETA Valgranges]] (with [[Co-Axial escapement]])
    * [[IWC 69000]] and similar [[MB 25.10]]
    * [[Sinn]] [[Sinn 910 Anniversary|910 Anniversary]] and [[Sinn 910 SRS|910 SRS]] [[rattrapante]] and [[flyback]]


<WRAP ud ud_mov>

**Description:**
  * [[Automatic]] [[chronograph]]
  * [[Escapement]] stone lever
  * [[Yoke winding system]]
  * Stop mechanism [[Cam switching]]
  * [[Glucydur]] [[balance wheel]]
  * Nivaflex [[mainspring]]
  * [[Incabloc]] [[shock protection]]

**Functions:**
  * Hours, minutes
  * [[Small seconds]] at the 9
  * 1/8-seconds counter, 30-minutes counter, 12-hours counter
  * Rapid calendar advance
  * [[Hacking seconds]]
  * [[Complication]]s 12-hours counter, day [[quickset date feature]]

**Data:**
  * 13¼ [[ligne]]s
  * D 30.0 mm, H 7.9 mm
  * 25 [[jewels]]
  * 28,800 A/h
  * Power reserve 44h

**Production period:**
  * Since [[1973]]
</WRAP>
===== External Links =====
  * [[http://www.chronomaddox.com/valjoux_7750_engine.html|The Valjoux 7750 Engine]]
  * [[http://people.timezone.com/library/horologium/horologium631672313433425752|The Valjoux 7750 Chronograph]]
  * [[http://www.calibre11.com/history-eta-7750-tag-heuer-calibre-16/|The history of the ETA 7750]]
  * [[http://www.watchtime.at/archive/wt_2008_03/WT_2008_03_156.pdf|The fall and rise of the Valjoux 7750]]


{{tag>Movements Automatic_movements Chronograph_movements Valjoux_calibres Automatic_chronograph_movements}}