Ken,
The copy you have here (MU 1067) is a UK reissue from 1968, intended for sale within the UK.
At the same time, MCA brought out a few other reissues, namely "Rock Around The Clock/Shake Rattle & Roll" by Bill Haley (which was the first of 2 reissues of the same track to chart here), and "Rave On/Peggy Sue" by Buddy Holly. As for a value on the Len Barry reissue, I would safely say around £3 at the most.
Therefore, these are all retro reissues, in much the same vein as the "Demand Performance" series released by Decca, Deram and London around the same time.
Gene