To achieve better accuracy, one of the ways is to raise the frequency of the quartz oscillator, in order to reduce the temperature variations.
If I'm not wrong the "standard" (or the most common) frequency is 32768Hz.
We can find 262144Hz oscillators in affordable watches, many of then reaching and accuracy less than 30 spy.
I have then the following questions:
1) According to your experience, I would like to know why the watch companies use so often 32K oscillators while a 256K would greatly and easily improve the accuracy with an almost zero price increase.
2) We have nowadays computers running at GigaHertz quartz clock speed. Why MegaHertz oscillators have been used only 30 years ago ? I mean, maybe megahertz oscillators are now really cheap and stable so why don't they use then instead of 32K oscillators ?
3) Is a TC quartz movement really expensive to be built ?
As always, thanks in advance for your valuable opinions and comments !