An interesting and rare bike.
If the bike was flooded - the frame probably filled with water - and subsequently stored away for 30 years in wet conditions it might be corroded inwardly and beyond saving.

The MAFAC "dural forge" (racer) brake was introduced in the end of the 40s or beginning of the 50s and built until the end of the 60s. See VeloBase:
http://www.velobase.com/ViewComponen...m=117&AbsPos=5
Look for possible grease holes (early versions).