Unknown release date and a "special for Jazz mail order" by ZYX Music. They are a German company formed in 1971 and have loads of sub labels reissuing all sorts of rock, pop and dance music as well as Jazz. Most of their Jazz reissues on LP seem to be from the 80's and early 90's on LP and later on CD. Still in business. They covered some good Jazz labels, but quality unknown to me. I doubt it was anywhere near the original master tape.
Probably a mistake as Stunsworth says, but a possibility that it electronically reprocessed Stereo? In which case it would be pretty awful.