These are the June 1968 studio re-recordings, not the concert (which was recorded the day before). Essentially the same release as Pickwick/33 SPC-3256 (Rockin'), but with the track "Love Letters in the Sand" included, which was omitted on 3256, and a different crop of the cover photo.
For anyone interested, the Comets featured on the sleeve are Al Rappa (bass), Rudy Pompilli (sax), Dave Holly (drums), Johnny Kay (guitar) and barely visible in this crop is Nick Nastos on steel. The photo is actually taken from a UK TV appearance in 1964; by the time these recordings were made, Holly and Kay had left the band and Nastos (under the name Nick Masters) had become lead guitarist and John "Bam-Bam" Lane was the drummer. The piano player was a session musician.