OK, I'm reworking what I believe to be a 1974 Motobecane Grand Touring (my father purchased it new in 1974). I've got some pics of different parts and components as well as the s/n from the BB (of course, it's even difficult to tell which way is up!). Hope this helps.
Weinmann 27"x1.25" wheels, Suntour V-GT Luxe derailleurs, DiaCompe/SuperCompe brakes, SR seat post, SR Apex cranks, Pivo bar and stem.