With the first series the housing of this integrated circuit was actually still made of ceramics instead of the later used plastics. Although the Girard-Perregaux movement shared the same basic components with the Beta 21, it was less complex executed. However compared to a modern day quartz movement, this is definitely another world. wdfreplica The most important accomplishment of the movement was its frequency of 32,768 Hz. This proved to be an optimum frequency and has even become the world standard for most quartz wristwatches!