I've never heard of this builder, but:
A., looks like very nice work, and
B., kind of doubt it would be as early as '74 with the Campagnolo 1010B (short) DOs and sans portacatena holes (but with some drillium holes!) my gut guess is: 'later'.
The early Phil hubs look "right", and that's a GPM (is it? the ring is) crank I've never seen before. Never seen a "unicanitor" style Brooks before, either...this has some rare details!