I'd say a lot, but definitely get it valued, as I may be wrong. Good luck.
Depends what is written IN the letter and if that is interesting
I'm not that sure but I've found an autograph signed by just John Lennon worth £2,549,21, hope this helps
Sean Lennon is a singer-songwriter, actor and musician. His mother and father are Yoko Ono and John Lennon. Sean is said to have a net worth of 200 million US dollars.
Around $50.00
1 cent
If it is signed by him? Possibly a pretty penny. If it is not signed by him? Standard used book price.
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$300, if it is personally signed
twenty dollars