Here's the 1988 Tange Prestige catalog section and the 2013 tubing page. The 1988 catalog shows Prestige as having 0.7/0.4/0.7 walls, and the 2013 catalog shows Prestige as having 0.8/0.5/0.8 walls (2013 Prestige JPN has 0.7/0.4/0.7). They're all double-butted Cr-Mo.
In 2013 Prestige JPN is heat treated, but Prestige is not.