the lennon looks fine. as for the harrison, I am sure there will be people that will say its authentic and it could very well be, but I do not like it.
I think there is something off about them too...the Lennon seems like it might be ok, signed hurriedly, but the George doesn't look right in at all, and the Ringo isn't right either; plus, Riingo always signed his last name back in those days...only did the first name thing, and sometimes then drew a star, in the last 15-20 years.