====== Seiko 4500 ======
[[Daini Seikosha]] produced just one 36,000 A/h "[[Hi-Beat]]" movement, the **4500** series of 1968-1974. These were used in high-end [[King Seiko]] and [[Grand Seiko]] watches in the 1960's and 1970's.

The **4500** family was introduced in [[1968]] to replace Daini's [[Seiko 4400|4400 calibre]]. It appeared in the [[King Seiko 45KS]] and [[Grand Seiko 45GS]] models. Thanks to the "Hi-Beat" accuracy of the 4500 calibre, the [[Seiko 4400|4420]] was no longer needed. The date function featured an "instant change" mechanism.

In [[1969]], Seiko introduced V.F.A. ("Very Fine Adjusted") versions of the 45GS, with monthly precision of +- 1 minute.

===== Variants =====
  * 4500
  * 4502
  * 4520A - GS standard official approval, No date
  * 4522A - GS standard official approval, Date 
  * 4580 - V.F.A., Date
  * 4520A - Astronomical Observatory Chronometer official approval, No date

===== External links =====
  * [[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]]


<WRAP ud ud_mov>

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

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

**Data:**
  * 25 [[jewels]]
  * 36,000 A/h

**Production period:**
  * [[1968]]-[[1974]]
</WRAP>

{{tag>Movements Manual_winding_movements High-beat_movements Seiko_calibres Daini_Seikosha_calibres}}