A CD-i disc made in May 1988. That's around three years before the official launch in USA. Probably one of the first CD-i discs ever made, but according to cdifan, these discs do not work on regular CD-i players as they do not follow completely the Green Book principles. The history of the development of the CD-i standard is very interesting and these discs are part of it. I'm sure, somewhere in the future, we'll be able to see more of the contents (probably technical based info about the Green Book.
[Thanks, Jorg Kennis, cdifan]