The Seiko caliber 8J42 is a 3-hand thermo-compensated high-accuracy quartz (HAQ) movement made in Japan.
Some of the topics covered in this caliber listing:
There is a similar caliber 8J41. The main difference between these two movements is that the 8J42 has a date at 3:00 and the 8J41 does not have a calendar complication.
The Seiko caliber 8J42 is said to run up to 3 years on a fresh battery.
Seiko officially claims that the accuracy of the caliber 8J42 averages at +/- 10 seconds per year.
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