Mafac 2000 brakes wouldn't be period correct for the '71 Hetchins. In terms of high-end centerpulls, even the CLB-2 was not shown prior to the Paris show in 1972, or 1973, but I think '72. The Mafac's design showed up on the Peugeot bikes in the TdF before you could get them in the states.
Ken, near St Louis