A group of 65 color slides from the Beatles' 1964 American tour are going up for bid.
They were taken by award-winning physicist Dr Robert "Bob" Beck.
Ernie Sutton from the British Beatles Fan Club said:
"New photographs that emerge of The Beatles are always of interest to the fans, but with the majority of photographs from this tour in black and white, it is a delight to see colour photographs from that historic tour."
Dr Beck's slides also feature close-up portraits from the Las Vegas Sahara Hotel press conference, the Las Vegas Convention Centre gig, plus shots of a private party at the Beverly Hills mansion of the then president of Capitol Records, Alan Livingston.