====== Seiko 4400 ======
The first [[King Seiko]] and [[Grand Seiko]] model from [[Daini Seikosha]] used calibre **4420**. Produced from 1964 through 1968, these were high-end [[manual winding]] movements.

The **4400** family used a slower 18,000 A/h oscillation rate than the derived [[Seiko 4500|Hi-Beat Calibre 4500]], which replaced it in [[1968]]. But it was accurate enough for use in high-end [[Seiko]] watches and allowed Daini to challenge [[Suwa Seikosha]] in the production of Grand Seiko watches. One unique aspect of this movement in the [[King Seiko 44KS]] is that a tiny weight was attached directly to the [[hairspring]] to improve accuracy. This is often removed during servicing, since most watchmakers are unfamiliar with this practice.

The 4400 was best known as the movement used in the legendary [[Grand Seiko 44GS]]. Introduced in [[1967]], the 44GS set the styling trend for all future Seiko watches and has been revered ever since. Seiko even created a replica 44GS in [[2013]], powering it with a special hand-wound [[Seiko 9S55|9S64]] movement to duplicate the 4420 as closely as possible.

===== Variants =====
  * 4420A - 27 jewels
  * 4420B

===== External links =====
  * [[http://www.seiyajapan.com/pages/the-history-of-grand-seiko|The History of Grand Seiko]]
  * [[http://seikoholics.yuku.com/topic/770/King-Seiko-Special-vs-Superior-Chronometer|King Seiki: Special vs. Superior Chronometer]]
  * [[http://www.grand-seiko.com/features/history.html|History of Grand Seiko]]
  * [[http://www.monochrome-watches.com/seikos-affinity-to-hi-beat-movement-part-two/|Seiko's Affinity To Hi-Beat Movement]]
  * [[http://www.watchprosite.com/show-forumpost/fi-657/pi-5568098/ti-824423/t--interview-akira-ohira-watchmaking-father-of-modern-mechanical-grand-seiko/|Interview: Akira Ohira - watchmaking "Father" of modern mechanical Grand Seiko]]


<WRAP ud ud_mov>

**Description:**
  * [[Manual winding]] movement

**Functions:**
  * Hours, minutes, [[central seconds]]

**Data:**
  * 27 [[jewels]]
  * 18,000 A/h

**Production period:**
  * [[1964]]-[[1968]]
</WRAP>

{{tag>Movements Manual_winding_movements Seiko_calibres Daini_Seikosha_calibres}}