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.
In a region where the time zone has changed after time zone information was set on your watch, the correct time will not be displayed even if time zone adjustment is performed through GPS radio reception. Please perform the following operations to display the proper time.
<To set the time on the product in a region in which the time zone has changed>
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Select the current time in the region, using the manual time difference setting (selection).
If DST (daylight saving time or “summer time”) is in effect, select a time that takes that into account. -
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.
Please see About manual time difference setting (selection) for details.
For details, please refer to Manual time adjustment.