That's a lovely bicycle. Congrats on finding the Motobecane.
Agree with berceau frame design, and checking components (brakes, gears, hubs) for date stamps.
Reckon it's 1960s (could be completely wrong!), but difficult to be more accurate, as sometimes bikes were left largely unchanged for years or decades.
I couldn't find earlier catalogues: from the 1967 Motobecane models, clearly shows the chainset and chainguard design on the bike. Also, the Type C.T.F. description seems to match quite a bit - but not fully: chromed fork crown, inverted brake levers & cantilever brakes, mudguards, 650b, dynamo etc... but I'm guessing the lovely metal cases - complete with Motobecane motif - on the rear rack, date from earlier.
There will be other people on the forum who know more. It may also be worthwhile posting at the US-based Bikeforums as there is a lot of interest and knowledge re French bikes.
p.s. looks like a Presta/ Schrader valve mix with the wheels