The accuracy of my PO8900 is quite erratic. I’ve seen +5 to 7s per day results, mainly from storing the watch for a day face up. Normal day to day wearing it’s around +3 to 4s, but can be much more or much less. My 18 year old SM120 is +\-0.5s per day and the most accurate and consistent watch I own. My Tudor GMT runs -2s per day consistently.
Although the CoAx PO is arguably within standard, I would have liked to see more consistency.
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