====== Seiko 6139 ======
**Seiko 6139** and later **6138** are pioneering [[automatic]] [[chronograph]] movements from [[Seiko]].

Introduced in 1969, alongside notable similar movements from [[Zenith El Primero|Zenith]] and [[Chronomatic]] and before the [[Lemania 5100]] and [[Valjoux 7750]], the Seiko was the first chronograph to feature a [[vertical clutch]] mechanism, an advance now found on many high-end chronographs. It was not a luxury movement, however, and was used in many utilitarian and [[tool watch]]es, including a "speed timer" and diver.

The 6138/6139 is related to the [[Seiko 6100]] calibre family, sharing some parts.

The 6138/6139 lack a running seconds hand. The central sweep seconds hand is only used for the chronograph function and there is no [[small seconds]] subdial. The day and date [[quickset]] mechanism is unusual for Seiko in that it is a [[crown pusher]] type The date is set with a light press of the crown, while the day is set with a deeper press.

===== The "Pogue" Chronograph =====
In [[1973]], astronaut and former Thunderbird pilot Col. William Pogue, carried his personal Seiko 6139 into space on the Skylab 4 mission. This yellow-dialed watch accompanied an official-issue [[Omega Speedmaster]], but he preferred the "speed timer" feature of the Seiko to time engine burns.

This became the first automatic chronograph in space, and the watch sold at auction in 2008 for $6,000.

===== Versions =====
There were two versions of the 6138/6139 chronograph produced. The later "B" movements feature a modified switching mechanism.

  * 6138 - Sweep 60 second, 30 minute, and 12 hour chronograph counters
  * 6139 - Sweep 60 second and 30 minute chronograph counters

All feature quick-set day and date.

===== See Also =====
  * [[Automatic chronograph]]

===== External Links =====
  * [[http://www.hodinkee.com/blog/2011/10/11/just-because-seiko-6139-the-other-first-automatic-chronograp.html|Just Because: Seiko 6139, The Other First Automatic Chronograph]]
  * [[http://www.hodinkee.com/blog/2012/5/31/in-depth-your-vintage-seiko-chronograph-buying-guide.html|IN-DEPTH: Your Vintage Seiko Chronograph Buying Guide]]
  * [[http://monochrome-watches.com/revisiting-an-icon-the-seiko-speedtimer/|Revisiting An Icon -- The Seiko Speedtimer]]

<WRAP ud ud_mov>
**Description:**
  * [[Self-winding]] [[chronograph]]
  * [[Column wheel]]
  * [[Vertical clutch]]

**Functions:**
  * Hours, minutes
  * [[Quickset]] day and date by pushing the crown
  * Chronograph 
  * 60 second sweep
  * 30 minute subdial
  * Optional hour subdial

**Data:**
  * 12 [[ligne]]s (27.0 mm), H 7.2 mm (6139) or 8.0 mm (6138)
  * 17 or 21 [[jewels]]
  * 21,600 A/h
  * [[Power reserve]] 45 h

**Production period:**
  * [[1969]]-[[1979]]
</WRAP>

{{tag>Movements Seiko_calibres Automatic_movements Chronograph_movements Automatic_chronograph_movements Suwa_Seikosha_calibres Column_wheel_chronograph_movements}}