Ghost of a flea

If we look at the details of construction of the Seiko quartz caliber 9F we see a movement that is dramatically superior to an average quartz movement. First of all, if you are still preoccupied with in-house this is about as in-house as it gets; Seiko not only has its own semiconductor facilities, it also grows its own quartz crystals in giant reactors, and from the raw crystals selects only the most pure for Grand Seiko quartz movements. To avoid drift in rate due to aging, the selected crystals are aged for up to three months. Each crystal is individually tested for its specific frequency response to temperature change, and paired with an integrated circuit specifically programmed for that crystal. Once inside the watch, the movement actually samples the ambient temperature 540 times a day, and uses that information to adjust the frequency of the crystal to compensate.