Can’t remember all the various french Makers, but the first set of letters (9 o’clock) signifiy the ammo assembler, and the 3 o’clock letter is the case metal supplier ( who may supply the coils of sheet metal, or the partly drawn cups)
The colour of the primer seal and neck seal lacquer is arbitrary…usually black, red or Purplish…may differ from year to year, and assembler to assembler. NO significance.
NO headstamp? a case missed a stage (head bunt) but otherwise was OK to load. Most factories imprint the headstamp marks with a machine separate from the Head Form and Primer Pocket formation machines. That way the hardness of the head can be more properly controlled ( each step in case head formation increases the Work Hardening of the case head, to the level required for safe use.
Regards, Doc AV