Signetics 2519B are on the way....
I was scolded for being so vague so here you go:
I've ordered a good handful of the ever elusive Signetics 2519B shift registers, allegedly with date codes from 1974-1976. I do not have them on hand yet, but will post more info when I do.
FWIW, 2519N will work as well... if you can find them :D