Munich branch (German: Geschäftstelle = GS) of the German CD/DVD manufacturing company Panteon.
Credit them for "Manufactured By" only, as the mastering and pressing was done by Panteon.
Spelt Panteon GS Muenchen in the matrix.
The Number 089 4399930 is not a code but a telephone number (occasionally spelt without the area code 089 for Munich).
Since run / taken-over by Opti-Medien, aka OMC GmbH from the same address.