This cover was made only for each members of the band.
And the record was realised in 1975 not 1973.
The real label is le "Kiosque d'Orphée". "Les Disques Le Maintec Bernard" is a fake label linked to Bernard Le Maintec who helped the musicians to release their LP. It's a kind of production even if i'm not sure that this guy paid anything for the release.
The catalog number is KO/750707 (stands for Kiosque d'Orphée (KO initials) and the date 07/07/1970