Thank you Faksta!
Some more information I glanned here and there...:
The 2141 appears 10 years later. If there is no doubt the style of the 2141 was influenced by this prototype for the front of the car but it was not an early version of it. The 2141 obviously took its inspiration from the simca 1307/8 (1975).
Please check the profile, the hood, etc.. you will see that this car is actually quite different from the 2141:
My understanding is that this prototype belongs to a serie a laboratory concept cars: C1,C2, C3, C4 (real, mock-up or only the drawing board):
C1:
if you look at the previous picture, you will see a BMW 5 series that the factory bought in order to copy the underneath.
C2:
C4: