This is a very tricky one, no mistake. It does not look like a faked item (what is it - an autograph-album page?) but a competent forger can achieve that impression. What strikes me about it is the relative sophistication of Marc's signature and script - it is almost proper joined-up adult writing which he is not famous for.
For that reason I would be sitting on the fence about it and therefore would not buy it. That's just my strategy.