rocco leaves that bike unattended and it's gone, baby.
Tange Prestige tubing was used in 1985 on the Centurion Prestige, and I believe in 1986 on the Panasonic DX6000. I'm not sure when it showed up on the Nishiki, but I did see a Nishiki Prestige with Prestige tubing. I've always assumed they all had it.
Tange Infinity tubing was used in 1983 on the Centurin Lemans RS, with 2001 Mangaloy forks.]
I'm not sure why other makers used it later, because I suspect Panasonic was making those frames.