Goldenyama,
I've got an Adidas NTP 90C, identical to yours but the midsize version. I got it by chance, but it's one of my favorites.
Kuebler's book has a little bit about the NTP series. It came out in 1989, and featured rubber inlays in the handle and "extended heart-construction (dampening members of rubber integrated into the heart)." I assume that's a red rubber piece, in fact, under the grommet strip on the bottom of the head on yours. I have the same thing. The series included a 105 Graphite, 105 Kevlar, 90 Graphite and 90 Kevlar. You and I have the C edition, which I'd guess stands for Carbon Graphite. The K version was Kevlar. They also made an NTP Junior.
Maybe some other folks on the boards know something more about Adidas' history and could add to that. I don't know if Adidas had any pros under contract at that point who might have used the NTP series. I also don't imagine it was a big seller, at least in the US, since I've rarely seen them anywhere.
But my 90C is a great racquet. I don't have the specs, but can tell you a few things. It's carbon graphite, stiff, heavy (must be 12 oz. plus), has a straight beam of about 22 mm., is headlight, and has a 16x19 string pattern. I used to play a Wilson Sting midsize in my younger days, and this is slightly larger but very comparable in feel. Very solid. I suppose the rubber inlays were intended to dampen it, but it doesn't seem very dampened to me, at least not in modern terms.
Hope that helps. I think you should string it up and go for it -- I bet you'll like it. Good luck.
Here are a few photos of mine: