The best "proof" that something was in the works is the inscription on the back saying "REJECT". This leads me into believing that there were actually plans for this one, but they were rejected.
But all that "REJECT" can imply is that it was rejected for SOME reason and not that Kraftwerk changed their minds. Maybe it was rejected because of poor sound reproduction quality for example.
This and the story I've got from the seller (who is a very serious dealer) leads me into believing that these lot of discs may be a personal collection of the records this engineer worked on? That's what I would do as an engineer anyway :)
Yep... I can believe that an engineer could sneak back a copy that he's been working on... and kept them in a nice collection for himself... BUT for the reason why that disk was produced in the first place is STILL a mystery. Another thought that I've had.... this may not even be an 'official' Kraftwerk disk at all. Maybe a bootlegger tried to have the disk made up.... and while in mid process it was discovered that this was not 'official' the disk was 'rejected' by the pressing plant! It's just a thought.... which is all that we have. Keep Werking John www.keepwerking.co.uk