I don't want to badmouth Mandarake too much, but they have sold KO's marked as vintage on a few occasions. Things like US TF's Dinobots and the Decepticon cassettes have been spooted in their stores. Granted - I don't think they label them as vintage to deceive buyers, but it doens't change the fact that they are there. So you should still be cautious.
Don't get me wrong - I love Mandarake, and I will shop there everytime I visit Japan. But just because they mark it as vintage, doesn't mean you shouldn't do your homework first.
