Pictures of The Beatles having fun during a visit to the studio where animated film Yellow Submarine was made are expected to sell for more than £40,000 when they go on sale on Friday.
The collection of previously unpublished colour transparencies of The Beatles show the Fab Four meeting their animated selves and laughing as they pretend to watch the film.
The images were taken at TVC Studios, in London, by freelance photographer Stephen Archetti.
Some 65 pictures of The Beatles are included in the collection of 161 transparencies taken by Archetti in late 1967 and early 1968.
The remainder of the collection features people involved in the production including director Jack Stokes, producer Al Brodax and master illustrator, designer and art director Heinz Edelmann.
The collection will go under the hammer at Omega Auctions, in Stockport, Cheshire, as part of a music memorabilia auction which features several other lots linked the The Beatles.