I saw the above while searching. I know Ebay is not the most reliable for info but I didn't look further when I posted.
I looked on Ontarios sit'e and the RAT 3 isn't even listed so it's not up to date either...........................
I'm with F3X, I really thought I saw a Rat in an A G Russell catalog with D2 blades and bone scales as a colledtor series of these knives. If so they were probably exclusive to that distributor. If not, then some other company maybe ... but I am fairly sure I saw at least one version being offered cuz' I thought .... "D=2 Rat ... Waka - Waka"