Imp. Polygram

Please don't use prior to 1984.
French printing division of Polygram, credited "Imp. Polygram" after Polygram Industries Messageries headquarters were transferred from Louviers to Antony in 1984.
Also often credited by the same two waves, stamped/embossed at the bottom of the rear cover.
If printed "Imp. Polygram Industries Messageries", please use Polygram Industries Messageries.

The "Imp. Polygram" print seems to have disappeared in 1987. It could stand for the printing stopped after the renaming from PDO, in 1986.