I'm still convinced it's post 1980. A touring model of some sort. The graphics are definitely the clue. And as far as the braise ons. Motobecane held off for a long time before they started to use them on thier Mid to upper end bikes. All the lower end bikes had them (Super Mirage, Nobly, etc.) throuout the 1970's.

Here is a 1976 Grand Record downtube... and they stayed with this look until 1977 or so when they changed the company downtube graphic to more modern style bock letters (example, from the 1979 catalog). They continued to use that graphic well through the 1980's. They added the banded graphics on the downtube and seattube around 1979 and later lost the banded style and added a plastic "Motobecane" badge on the top tube. It was during the early 1980's that they switched to the blue, white, red "M" headbadge.