This cheap 60s and 70s compilation CD contains JMJ's version of Pop Corn. The sound quality is very, very good! I'm not 100% sure, but this does not sound like a vinyl rip, but a copy from a tape master.
According to the cd matrix inscription, the CD has been pressed by Inter Service Press, which is in Belgium. Bear in mind that Pop Corn was released on vinyl in Belgium as well, so it can be that they used some master tape to produce this CD.
If you want to judge yourself, send me a PM