This is the "new" New-Nikkor (also known as "K") 135/2.8. As you said, this is closely related to the AI version. The AIS shares the same optics but I believe it is a little different mechanically, so not sure how much of this tear-down is relevant the AIS model. There is also an "old" New-Nikkor 135/2.8 which has optics from the older Nikkor-Q version.