Rare black and white photos of The Beatles' historic 1965 concert in New York, taken by an amateur photographer who bluffed his way backstage, have sold for 30,680 pounds, nearly double the pre-sale estimate.
Marc Weinstein used a fake press pass to get next to the stage for the historic show at Brooklyn's Shea Stadium.
The only other photographer present ran out of film during the gig.
Weinstein's 61 black and white images with copyright fetched 30,680 pounds, compared with a pre-sale estimate of 15,000-20,000 pounds, Omega Auctions said.
Shea Stadium was The Beatles' biggest concert - and the biggest ever pop concert by any group up to that date.
It came at the height of Beatlemania and the band's music was famously drowned out by the screams of the 55,000-strong crowd.
Weinstein later recalled how he used a home-made press pass to con a policeman into escorting him to the stage area.
"I just blended with everybody there," he said. "I had a method of operation; I just acted like I belonged. Anybody in authority, I would look the other way," the BBC reported.
Auctioneer Paul Fairweather said the successful bidder was "a South American gentleman currently living in Washington [who] is a huge collector of Beatles memorabilia".
A further collection of 65 unpublished colour slides of The Beatles taken by physicist Dr Robert "Bob" Beck in 1964 sold for 27,140 pounds. They had an estimate of 10,000-15,000 pounds, the report said.
