I've seen the serials, as related to the board revision, all over the place. I do keep a log of serials and board revisions, but it's not a complete list -- only the systems I've modified over the last year or so have I logged the board revision.
This is why I tell people NOT to use the serial as a guideline as to what Neo you are buying. I've seen some Neo systems that have had really low serials, but have a 3-x board. Of course, I don't know the history of every Neo so I have no way of knowing if SNK swapped the board on a repair, the shell was replaced, or what the deal was. So, all we can do is assume that a serial number *may* be of a certain board revision.
I'm not sure I would want to list any specific details, but I could probably do a generalization based on the system's I've logged.
Jeff