There are amny people claiming to guarantee the authenticity of autographs. At the Fame Bureau we believe it is a truly specialist subject and as a result when we deal with autographs we tend to err to those who specialise in very few studies. The adage ‘Jack of all Trades, Master of None’ is extremely pertinent in this field which is why we err to caution, focus and experience. The following article is by our expert Beatles autograph authenticator.
https://www.autographworld.com/beatles/sigstudy1.asp?sf=0