Dynorooz changed to 3G when Columbia was purchased by Ebonite and Ebo got the Dynothane brand. Phil (newguy) retained the shoe line and the shoes became 3G or 300G.
I've got a pair of Tour Ultras and they're fantastic. Very comfortable, mine still look new, going on two years old. You cannot go wrong with a nice pair of TUs, best shoe you can buy. I got mine from tekneek, he should be able to hook you up.
SH