A signed copy of the rare Beatles '65 album, linked to the 'Help!' film, will be auctioned this month, estimated at £20,000-£40,000.

One of the rarest Beatles albums in the world is going under the hammer.

A signed copy of the Beatles' American-only album Beatles '65 is one of two copies known to survive. It could be yours if you bid at Anderson & Garland's Collectors' Auction on August 27.

The signed album which is thought to be one of only two left in the world. | other 3rd party

placeholder image — The signed album which is thought to be one of only two left in the world. | other 3rd party

But it won’t come cheap as the auction estimate is £20,000 to £40,000. The album carries a direct and well-documented connection to the filming of the band's second feature film, Help!

The Beatles' were in the Bahamas in February 1965 to film warm-weather location scenes for the film. The band spent 15 consecutive days filming across locations before leaving for New Providence Island. Their management chartered a BOAC Boeing 707 for the journey, and among the cabin crew on the return leg was Angela Bass (née Bourton), a BOAC air stewardess.

Max Bass pictured holding the Beatles album which his mum got the Beatles to sign in 1965. | other 3rd party

During the flight back to London, she chatted with all four Beatles, and asked them to sign her personal copy of the album. Three of the band signed the reverse of the sleeve; George Harrison signed the front.

She also had them autograph the flight's first-class menu, which promised cabin service including fresh Canadian salmon mayonnaise, breast of chicken Madeira, French beans and roast potatoes, a tossed salad with Roquefort dressing, a wine list drawn from Bordeaux and the Côte d'Or, and a choice of English or American cigarettes. That menu was later sold for more than £5,000, and was subsequently acquired by the Beatles Story museum in Liverpool, where it now resides.

A close-up look at the album which will go up for auction this month. | other 3rd party

The album has remained in the family ever since and is now being consigned for sale by Angela Bass's son, Max Bass, from the Wirral, on behalf of himself and his two brothers.

Speaking about the album and his mother's memories of the flight, Mr Bass said: "She particularly enjoyed chatting with George Harrison, who she said she talked to for hours, and always said how easy he was to get on with." This album has stayed in the family ever since our mother passed, and between the three of us brothers, we decided the best thing was to move it on to a collector who would really value it."

The album will be offered at Anderson & Garland's forthcoming Collectors' Auction.

The lot is available to view online now.