Losing time and stopping is a pretty obvious symptom of this problem to me, rather than a "sleeper" problem that bites you at the first service, 4 or 5 years in.
I would still go for it. My PO 39.5 has been- by far- the most consistent mechanical I've ever owned, and a fantastic looking piece of hardware! I'd buy mine again, even with this knowledge. Just make sure your watch is under warranty from an AD or Omega store, and you should be all set.
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