My friend picked up a used PO 8900 recently (but like new and under Omega warranty). After wearing the watch everyday for 3 weeks it is about a minute slow and is consistently about -2.5 spd.
In the grand scheme of things that is pretty good accuracy... But on the flip side it is out of spec I believe.
I’ve been telling him to send it in to Omega because having something out of spec would bug me to no end, I’m too OCD. Also I hate slow running watches. One thing I don’t know is would Omega regulate the watch for him under warranty?