The case back shows the caliber-case number of your watch.
The number to identify the watch type
Caliber/case number
Display may vary depending on the model.
By referring to caliber-case number shown on the case back, you will be able to determine when the time zone data was configured.
For more details, refer to the URL below.
If the official time zone, etc., has changed in a region after the watch’s time zone data or DST (Daylight Saving Time) data was configured, the correct time will not be displayed even after receiving GPS signals. Please perform the following operations to display the correct time:
<To set the time of this watch in a region where the official time zone or DST (Daylight Saving Time) has changed>
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Select the time zone appropriate for the current time in the target region by manual time zone setting and do settings for DST (Daylight Saving Time), as necessary.
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Next, adjust the time by manual time adjustment.
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When using the watch within the same time zone, the correct time will be displayed after automatic (GPS) or manual time adjustments.
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When moving from a region where the official time zone has changed to a different time zone, then back to the region where the official time zone has changed, carry out the same operations from 1. - 3. as indicated above to display the correct time in the region where the official time zone has changed.
For details, please refer to Turn ON DST (Daylight Saving Time).
For details, please refer to Manual time adjustment.