====== Quartz movement ======
{{wst>image_cl|ETA|Quarzwerk 955.102|ETA Quartz movement 955.102}}

Electro-mechanical [[watch movement]]

In a quartz movement a crystal is made to vibrate in electrical oscillations. The frequency is then divided down to one cycle per second, detected visually by jerkily moving the seconds hand. The second step is transfered with a tiny motor to the [[gear train]].

In principle quartz movements run more accurate than mechanical movements, however they mostly need batteries.

Today, quartz movements are to be found mainly in watches of the lower price ranges and in most women's watches.

===== Early Quartz Movements =====
  * [[Beta 21]] (1967-1972)
    * [[Omega 1300]] - first Omega version (also called IWC 2001)
    * [[Omega 1301]] - second generation (IWC 2002 is similar; Omega 1302 lacks seconds or date) using 8192 Hz quartz tube at first, then 32 Khz quartz crystal and finally surface mounted quartz package around 1976
    * [[Longines QuartzChron]]
  * [[Longines Ultra-Quartz]] Cal. 6512 (1969-1972) - first quartz movement announced for production but was delayed by over two years
  * [[Seiko 35|Seiko Cal. 35A]] (1969-1970) - The original [[Seiko Astron]] movement
  * [[Girard-Perregaux Elcron]] Cal. 352 (1970-) - 32 KHz with stepper motor, also used by [[Jaeger-LeCoultre]] as the [[Jaeger-LeCoultre Master-Quartz|Master-Quartz]] and [[Favre-Leuba]]
    * Cal. 353 was thicker and used a thicker battery
  * [[Seiko 38|Seiko Cal. 38]] (1971-) - Advanced quartz movement with stepper motor, first mass-produced quartz movement from [[Seiko]]
  * [[Ronda 1377]] (1973-) - [[Ronda]] partnered with [[Motorola]] to deliver an in-house movement
  * [[Omega 1310]] (1972-) - [[Omega]]'s first in-house quartz movement, 32 KHz
  * [[Omega 1510|Omega 1510 Megaquartz]] (1973-) - [[Omega]]'s high-frequency quartz movement, 2.4 MHz
  * [[ESA 9180]] (1972-) - [[ETA]]'s first in-house integrated quartz movement with a stepper motor
  * [[Seiko 39|Seiko Cal. 39]] (1974) - Includes an [[LED]] module to "tick" with the seconds hand
  * [[Seiko 0903]] (1975) - [[Seiko]]'s third-generation quartz module

===== See also =====
  * [[Quartz watch]]
  * [[Quartz crisis]]


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