McCartney has become an increasingly difficult signer over the last few years. On top of being reluctant to sign in general, McCartney has had a standing policy of refusing to sign guitars for many years (with the exception of charity functions), thus the supply of McCartney signed guitars has dwindled and values of said guitars are swiftly on the rise.
Accompanied by an auction-style Letter of Authenticity from James Spence Authentication (JSA).