Lennon signed the American Airlines-branded paper as St. John Leper, alluding to Lennon's controversial "we're bigger than Jesus" comment -- the extra piece of Beatles history, albeit not something they would've wanted to be remembered for, making it all the more lucrative.
You may remember ... the remark drew considerable backlash from Christian communities -- some radio stations even refused to play their music, and their records were banned. The criticism got so ugly, it led to the end of The Beatles' touring career.
McCartney's signature is also extremely rare ... with him referencing Father McKenzie from the "Eleanor Rigby" track. Both of these unique signatures make it worth more $.
The autographs were obtained by Bess Coleman while working as a publicist at EMI Records.