These are definitely authentic and the dealer is a very well know Beatles dealer (mostly high end vinyl). Would put the autographs at 1963 or even at the end of 1962, would happily buy these. Have a feeling the price will go high for these. Best of luck on them if you are bidding Paul.
And thats normally a good indicator too of the authenticity of Beatles autographs, the price, the good ones do demand the higher prices. Well best of luck anyway, a very nice set. Wish I had deeper pockets too.