i bought a pair of these brakes
from a member of the list to put on
my super sport that is fully equipped
with three decades of dura ace components
(and campagnolo wheels and shifters).
they certainly can't be any later than
the late 70's. the finish isn't all that great,
but after sanding and polishing them by
hand they are very handsome.
mechanically they are quite wonderful,
with brass (bronze?) bushings and fairly
intricate nylon and rubber seals.
i'm very fond of them.