For me it looks French, all French parts (as visible) if original.
I agree, but beyond that I'm stumped.
I would place it a bit earlier, you might get the Simplex gear time line, and find when the earliest TA square cotterless was.
TA made square taper cranks from at least the early sixties, but the Pro 3-attaches
model didn't appear until about 1970. Joe Metz puts it at 1969, and he knows his oignons
I'd guess early seventies.
Calmes dans le demi-jour
Que les branches hautes font,
Pénétrons bien notre amour
De ce silence profond.