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This is ridiculous.
Your second hand watch is a 2001 model and it's only required to run within COSC specs (+6 to -4).
So yours is 1 second faster than that but is by your account showing exceptional precision.
I respect a high level of accuracy as much as anyone but would be content with it until it's next service becomes due and ask them to pay special attention to the timekeeping.
If it's genuinely bugging you, then by all means take it back and ask if they could fine tune it to run closer to 0 if possible which should be achievable given it's outstanding precision.
If you do take it back make sure you are kind enough to praise their workmanship regarding the precision of the watch.
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