Late March 1963
This photo was used in a Vox amplifiers advertisement which began to
appear in late May 1963. Paul received his new T-60 bass amp around
late March 1963. The photo must date shortly thereafter because by,
at least, 4 April 1963, Ringo finally had a real Beatle haircut.
In this photo, he still has his old style.
It's difficult to tell if the gear was set up for the Vox ad or if the
photo was taken at a venue where The Beatles were performing.