AFAIK all revisions from before the code review system was put in place are marked "ok". Doesn't mean they are bug free of course :)
Nope. There's loads not marked. Hence why I added the "old" status =)
"old" only covers revisions up to r14928
r14929 - r22661 are mostly "new"
after that they start being OK but not marked by anyone, until around r43400 -- the time code review was introduced -- at which point the status change is logged
presumably revisions before that were set to OK somehow before you started doing the "old" thing