A 12-string guitar played by Beatles stars John Lennon and George Harrison and thought to have been lost for almost 60 years is going up for auction.

"The discovery of John Lennon’s Help! guitar that was believed to be lost is considered the greatest find of a Beatles guitar," Darren Julien said.

LONDON (Reuters) - A previously lost 12-string acoustic guitar that belonged to the late John Lennon will go up for sale at an auction in May after it was recently found in the attic of a home in Britain.

The Beatles' Ringo Starr has been reunited with his late bandmate John Lennon's long-lost Framus 12-string Hootenanny acoustic guitar after more than half a century. The instrument, integral to the recording of The Beatles' iconic "Help!