MADE IN WEST || GERMANY, no manufacturer on front.
This disc variation says MADE IN W. GERMANY BY PDO etched around the center hole.
These are the only three disc variations that I am aware of.
Front cover of booklet
Back cover "Printed in West Germany" without UPC.
The common BY POLYGRAM disc variation can be found with this back inlay.
There are two minor color variations available for this inlay. On one, the dot
screen is so tight that the background appears to be solid brown. On the other,
the dot screen is wider, and it is obviously composed of tiny dots.
Back cover "Printed in West Germany" with UPC.
All disc variations have been found with this back inlay.
This back inlay is also available with the same color variations described above.
Notes: This disc is quite common. Tracking down the variations is trickier.