The pristine, black-and-white photographs, which had been stored in a box for 45 years, chronicle The Beatles appearances in Washington, D.C. and Baltimore. They will be sold in individual lots when they go under the hammer on July 20 in New York.

"The intimacy and up-close quality differentiates this collection from those that have followed," said Cathy Elkies, Christie's director of iconic collections. The Fab Four performed their first US concert at the Washington Coliseum on February 11, 1964, two days after their legendary debut on The Ed Sullivan Show. Washington teenager Mike Mitchell, then 18, was on hand at Union Station when the Beatles arrived and documented the shrieking hysteria of their fans.

Mitchell, who still works as a photographer, also shot the pre-concert press conference and was positioned at the stage for the entire Coliseum show. Months later he documented the Beatles concert at the Baltimore Civic Center. Friends encouraged him to put his little-seen photographs up for sale.