MADE IN WEST || GERMANY (no manufacturer on front of disc).
This disc variation says MADE IN W. GERMANY BY PDO HANOVER etched around the center hole.
These are the only three disc variations that I am aware of.
front cover of booklet
Rear tray insert, Printed in West Germany, no UPC
The disc variations with BY POLYGRAM on front can be found in this back inlay.
Rear tray insert, Printed in U.S.A., with UPC
The disc variation without BY POLYGRAM on front can be found in this back inlay.
More commonly, though, a US non-target disc will be found within.
Notes: This disc is relatively common.