Yes, it's completely genuine and worth quite a bit on Ebay, the Green one's were unusual but I did see a few Hooray Henriettas with them in London in the 80'd, very nice, if you want to sell it I'd be very interested.
Are you still interested in purchasing a Dundee?
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Looks just like mine (apart from the color):http://www.flickr.com/photos/jmarkbertrand/3382584410/Not sure when they were made, but mine was purchased at a UK stationer in the mid/late 90s.
Thanks for the info you guys! I don't know who the seller is of this Filofax but it sounds like they have a valuable binder.
I have one purchased at an estate sale in Midland Michigan for $3 a few years ago in good shape (not perfect; dark green and functional; came in the box which I disposed in the trash as I use the Dundee). I did not realize the pricey item that I purchased and placed small sticker on the front cover which I removed after a year leaving a pale spot, but the Dundee is very soft and a beautiful dark green color; what texture. I would say yours faded in the sun. size 5" by 7-1/4 approx.
I have the 5" by 7-1/4" dark green (your cover looks faded) Dundee and they are very authentic, although I purchased mine at a pricey estate sale in Midland, Michigan for $3 in the box looking brand new. The soft feel calf leather is phenomenal and the size fits in a medium size purse/tote/bag.