July 1961
The Cavern
10 Mathew Street
Liverpool

The specific date for these photos is uncertain, but probaly between
2 - 26 July 1961. They're taken after the 1961 Hamburg visit because Paul has his new Hofner bass. George is still using his Futurama guitar. He purchased his new Gretsch Duo Jet sometime in July 1961, before 26th July.

In July 1961, The Beatles played The Cavern on the following dates.
14 (two shows), 17, 19 (two shows), 21, 25 (two shows)