The closest I have is Calibre. All letters look pretty close (if not matching) except for /a. As I was unable to find it even with the complete character map, it may have been customized.

Thanks!

Grafik magazine was composed with ITC Avant Garde Gothic
http://www.linotype.com/fr/563/itcavantgardegothic-famille.html

I still don't know if it has been based on Calibre, at least it resembles it now. What I know though is it can't be Avant-Garde to me or it has been so customized nothing has been left from it. All letters are off.