Frederik,
I am by no means an expert, but I'll take a stab at it. Based on the over BB cable guides, one set of water bottle braze-ons, the seat stays to seat lug finish, and a flat fork crown I would guess this frame was from the mid to late 70's. Perhaps as late as the very early 80's. The graphics look somewhat 80'ish. Does anyone come up with a different age?
Regards, Rich Robinson
Jacksonville NC