I do not believe this to be authentic. it appears too deliberate and slowly written. and the slant seems odd. but I will say that Lennon had many different signatures styles depending on his mood and the circumstances, but I would still be surprised if this were authentic.
Agreed, I don't feel this to be authentic. It's way too slowly written and I just in general have bad vibes from it, it looks close but I think no cigar. I could be wrong, did you ask the seller when and where it was obtained?