Show some images, brakes have a number of "period" identifiers, the Cranks have codes from the 70's onward prior and later also have some characteristics beyond the date codes.

As an example:
Brakes, no identification on the alloy arms, 1968
Sans Serif text flat quick releases 1969 to 1977
(some minor differences in the levers)
"Spoon" quick releases, from 1978
Later 80's arms changed shape, with Campagnolo in "script"
(some other differences as well to the cable fixing nut, block holders, pivot nuts....