^don't think so: the '70 Gran Tourisme came with "all Campy" drivetrain (including monstrous GT rear derailleur) and specs list Campy forkends, so I'd bet that means Campy DOs, too....also specs Prugnat lugs and this bike sure looks to have duBois.
http://www.gitaneusa.com/images/catalog/1970_pg11.jpg
Also don't seem to use the type of cable/housing stop braze-on that this unknown frame has on the chainstay.