Unicanitor saddle, and a sexy stem.
Bike-boom bike, probably early 70s.
Raleigh used the same Huret derailleurs and similar cottered cranks on their Record and Grand Prix from 1970 to '76
The 2nd gen Allvit was made for almost 20 years, early 60s to 1980, though the stamp style dates yours into 70s, with certainty.
here's what Sheldon had to say:
Libertas
There were a lot of these with 531 maintubes. Parts were often a bizarre mix of names rarely heard in the U.S. Such bikes are probably worth $200 or so. Bikes with better components and full 531 frames would have values approaching $500. [Belgium]
I'd say he's a bit more than generous on value (he's probably talking about full Campy).
You have a nice project bike there, and good-looking, but would be tough to get $200 for Mint - a mint Super Course will barely bring that. Essentially, that's the guideline - straight-gage 531 main triangle (3 Tubes) is equivalent to Raleigh Super Course, early-mid 70s.