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Because of the way they cut the T-logo in there right in the middle of the chierici font. It just looks wrong considering that all Tommasini's I have seen so far are true works of art with a lot of attention to detail. You're right, I don't have any hard proof for my subjective feeling of it being a fake abd I'm not an expert so the 99,9% statement is actually bullshit. Having said that, I would bet a considerable amount of money on it being a fake with a real tomm fork. All it takes is a dremel and some pantographing skills basically.
p.s. the tubes look round where they meet the lugs. + tomm used ms/max/el os tubes so they had a considerable amount of expertise in that field. + Most tomms had tommasini engraved dropouts afaik.
but again, it all comes down to a subjective feeling :)
Honestly I think he didn't know or wasn't sure. If he was trying to deceive anybody, he wouldn't have included the picture of the bottom bracket. There's a good chance the buyer will be super happy with his purchase, it's unlikely that anybody on the street will ever doubt the bike's provenance as the only clue is only visible from the underside of the bb. That being said, I'm 99,9% sure that tommasini wouldn't have made a bottom bracket like that. If they had ordered it from chierci (which I don't believe) I don't think they would have cut their own logo in there in such a crude way.