All four Beatles signed the back of this postcard in pencil while attending a Who concert at the Saville Theatre in London on January 29, 1967. George added "The Beatles" above his signature. The postcard pictures the North Entrance and Colonnade from the British Empire Exhibition of 1924. The signatures were acquired by a gentleman who worked at the theatre at that time. I have a similar postcard signed by all members of the Beatles and the Who from the same source. I would gladly send a scan of that item for comparison and further provenance. These signatures were authenticated by STAT Authentic. The postcard is in very good shape. The forty-year-old pencil signatures have aged well, as they have certainly been taken care of. John and Paul's signatures overlap at one point. An exceptional set of Beatles signatures, distinct and unhurried. Full sets of Beatles signatures from this period are quite rare. I will gladly send you further scans, including the obverse of the postcard, which can be seen pictured on the inset photo of the COA.