====== Seiko 36 ======
**Cal. 3600** was an early [[quartz]] movement from [[Seiko]], only their second production quartz movement. It was produced only in [[1970]] alongside the breakthrough [[Seiko 35|Cal. 35A]], but quickly set aside in favor of [[Seiko 38|Cal. 38]].

===== History =====
[[Seiko]] was quietly racing to develop a [[quartz watch]] movement in the 1960s, and delivered their first [[Seiko 35|Cal. 35]] movement to the [[Neuchatel Observatory]] in late [[1967]], just a few months after the [[CEH]] delivered their [[Beta 21|"Beta" quartz movement prototypes]]. A product of [[Suwa Seikosha]] Cal. 35 used a 8,192 Hz of 16,384 Hz quartz crystal and an [[integrated circuit]] from [[Intersil]] in the USA. Seiko offered Cal. 35 SQ for sale in the [[Seiko Astron]] watch on Christmas Day, [[1969]], with 100 examples sold in the first month.

Suwa rival [[Daini Seikosha]] developed Cal. 3600 and launched it just after Cal. 35 in [[1970]]. It was the first quartz movement to use a [[CMOS]] integrated circuit, which gave it a power consumption advantage. But Cal. 36 was still quite early to market and was retired later that year after perhaps only 1,000 examples were sold.

Variants on Cal. 36 included Cal. 3600, 3602 (36 SQC), and 3605.

Suwa's next quartz movement, [[Seiko 38|Cal. 38 SQW]] was more production-ready and went on sale in late [[1971]]. The Cal. 38 series marked the first true production quartz watch from Seiko.


<WRAP ud ud_mov>

**Description:**
  * [[Quartz]] movement with [[stepper motor]]

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

**Data:**
  * ? [[jewels]]
  * 16,384 Hz
  * [[CMOS]] [[integrated circuit]]
  * [[Stepper motor]]

**Production period:**
  * [[1970]]
  * Successor [[Seiko 38|Seiko 38SQ]], [[Seiko 39|Seiko 39SQ]]
</WRAP>

{{tag>Movements Quartz_movements Seiko_calibres Seiko_quartz_calibres}}