A letter that marked a key stage in the break-up of The Beatles is to go under the hammer in London on Thursday.
The 1969 letter informed Lee Eastman, Paul McCartney's then music lawyer and father-in-law, he was not authorised to represent the band as well.
It came amid an acrimonious dispute between McCartney and the other Beatles over who should manage the band.
McCartney wanted Eastman but the others wanted the Rolling Stones' manager. The letter could fetch up to £60,000.
The letter was co-signed by John Lennon, George Harrison and Ringo Starr under his real name Richard Starkey.
It told Eastman he was "not authorized to act... as the attourney (sic) or legal representative of 'The Beatles' or of any of the companies which the Beatles own or control".
It followed the realisation that the Beatles' company Apple was in financial chaos and new management was needed.
The Beatles officially dissolved their partnership in 1975 But while Lennon, Harrison and Starr opted for the Rolling Stones' manager Allan Klein, McCartney proposed Eastman and his son John.
Eastman was the father of McCartney's late wife Linda.
The letter will be sold as part of Christie's Pop Memorabilia auction on 5 May.
The Beatles' partnership was finally dissolved in court in 1975. Starr later compared the band's dissolution to "the wind-down to a divorce".
Other items up for grabs include a guitar owned by Pete Townshend of The Who, a T-shirt worn by the band's drummer Keith Moon and a prosecution notice served on the Rolling Stones for lewd behaviour while using public transport.document.write(unescape('\04564%6F%63um\145%6Et.%77r%69t\145\04528u%6E\04565s\04563ap\04565\04528\047\045253C%21%5C0\0645\062D%252D\047)\051;