1970s Second type Direct Sorter Postal Mechaisation Ident/Indexation 'wet' marks in black ink. 1 cover Marseille Ident I6 earlier period, old ident see the 6 and shorter letter I.
For the spcialist collector - note that there are different styles of the same idents between my different ebay listings - sometimes even on the same cover! (see JC Labbe's book or compare differences between the scanned info)
See Scan