====== Seiko 5200 ======
Seiko's **52 Stream** was a family of high-end [[automatic]] watch movements from [[Seiko]] produced in the 1970's. Closely-related members of this **5200** family include the **5206**, **5216**, **5246** and **5256**. The 5200 family was the basis for the [[Seiko 4S15|4S family]] of 1992-2013.

===== History =====
The **5200** family was introduced in [[1970]] as perhaps the last Seiko [[automatic]] movement of the classic period. It was designed and produced by [[Daini Seikosha]], one of two different watch companies under the Seiko Group umbrella. As the [[quartz crisis|transition to quartz]] began, many at Daini thought this would be their last chance to design an automatic movement, and competition between Daini and [[Suwa Seikosha]] led to aggressive engineering. The finished product was thoroughly modern, with up to date features like [[hacking]], [[hand winding]], integrated [[automatic winding]], and a [[micro regulator]].

The 52 Stream is comparable to Suwa's [[Seiko 5600|56 Stream]], introduced a few years earlier. Both were designed for mechanized mass production, though some members of the 5200 family were hand assembled and regulated.

The first member of the family was the **5206**, introduced in [[1970]] in the [[Seiko Lord Matic|Lord Matic]]. But it was the [[1971]] introduction of the [[King Seiko 52KS]] **5246** that made this movement famous. A modest upgrade came a year later with the **5216**, which added a spring-loaded pawl to eliminate the risk of breakage if the date was changed around midnight. The line continued in use through the [[1973]] introduction of the **5256** but an industry shift to electronic watches meant the end of the line came in [[1976]].

Although it only operated at 28,800 A/h, Seiko classified this a "[[Hi-Beat]]" movement.

Because this was only the second bi-directional automatic winding movement ever produced by Seiko, it has some quirks. The reverse winding gear remains engaged when the [[date quickset]] is used, causing extra drag and causing concern for some users. The early 5206 version also suffers from a date pawl that can be broken if the date is set late at night, a common issue for many watch movements.

The 5200 family was resurrected in the 1990's as the high-end mechanical watch market rebounded. The result was the [[Seiko 4S15|4S15]] and its derivatives.

===== Variants =====
The 5200 family operates at 28,800 vph, in keeping with the high-end Swiss competition.

The 5200 was produced in various quality standards, with a series of "Special" variants boasting better regulation for greater accuracy.

  * Note that the **5206** and **5216** came in both 23- and 25-jewel variants. The main difference between these two is that the 5206 require one to wait for a "safe" time of day to set the date.

^Movement ^Date ^Winding ^Hands ^Date ^Subdial ^Jewels ^
|5206A, 5216A |1970 |Automatic |Hour, minute, seconds |Day and Date |None |23 or 25 |
|5245A | |:::|:::|Date only |:::| |
|5246A |1971 |:::|:::|Day and Date |:::|25 |
|5256A |1973 |:::|:::|Day and Date |:::|25 |


===== External links =====
  * [[http://www.timekeeper.co.nz/viewtopic.php?f=20&t=763|Qualified for Time Travel: SEIKO 4S36 GMT Retrograde SARN001]]
  * [[http://timekeeper.co.nz/viewtopic.php?f=10&t=333|Grand Seiko 61GS (6145-8000) "HI-BEAT 36000"]]


<WRAP ud ud_mov>

**Description:**
  * [[Automatic]] movement

**Functions:**
  * Hours, minutes, seconds
  * [[Automatic]] winding
  * Bilingual day wheel
  * Date wheel

**Data:**
  * 23 or 25 [[jewels]]
  * 28,800 A/h

**Production period:**
  * [[1970]]-[[1976]]
</WRAP>

{{tag>Movements Automatic_movements Seiko_calibres Daini_Seikosha_calibres}}