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If it's a fake it's a good one. The (unamed) Japanese collector's site has two: http://www5b.biglobe.ne.jp/~m-task/travelfax.htm
Don't know about the validity but I LOVE the colour :)
It's just shouting out for a new Travel Journal insert!
Yes, it is a genuine Filofax. I own one in black that I purchased at City Organiser in London in the 1980s.