"Pre Ban" really has almost no cachet anymore, not since 2004.
A year ago, a 6601 might have been worth $6-700 NIB; today, it might be worth $1100, but, that's a maybe.
It's been a decade since "pre ban" had any real meaning. All of the features from before are available now, there was no special sauce back then to be worth any extra now.
In the various State AWB, they are all over the place as to what grandfathering is or isn't, and that's case-by-case, and still subject to arguments by Reasonably Knowledgeable Individuals.