Great find indeed! Those are fantastic bikes, in my opinion the best frames made at the time and maybe even now! As you may know I own a 87 Team I bought new and it's been a great bike. The frame is the splined triple butted Miyata tubing that at some point Columbus copied it when they came out with their SLX tubes. While not an ultralight tubeset, the spline engineering allowed the frame to be stiffer so it would have little bottom bracket flexing that was prevalent in non splined tubing, but that spline made the frame a tad heavier then non-splined tubing.

My bike's coloring is similar to yours except sort of reversed, and my decals are yellow. The only change I did in ascetics is change the black cable housings to yellow to match the decals, and I replaced the black stem with a silver one and black seat to white and white hoods from black. I don't like a lot of black on my bikes.

Yours is a 1990 Team in case you didn't know. Yours appears to be in fantastic condition too. Congrats.