COSC rating. Would this constitute , accuracy, without the official rating?

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My watch has been running for going on 7 days. it was set/hacked at 12:35pm on august 6, 2025 and has not been touched again. Other than winding.
Clarification: has not been touched again with regard to resetting the timing.

It's running a 9019 Miyota movement.
As of today it is running 3 seconds fast.

If averaged over a 6 day period , it seems to suggest less than 1 second per day +/-. So far, this is the most accurate mechanical watch I've ever experienced. Would you guys say this is…

COSC rating. Would this constitute , accuracy, without the official rating?

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