My guess is that this keyboard was built around 1974 (according to the IC manufacturing dates).
The switches are magnetic pulse type (often mistaken for hall effect, but it also uses magnets, and is always NKRO, Hall Effect keyboard made by Honeywell may not be NKRO in some cases).
Linear switches, I've seen them used by HP on some early keyboards. I don't have direct proof but I believe that the switches were designed by ITW (Illinois Tool Works), which if you follow my research, also have the patents on the RAFI magnetic pulse switches, and a bunch used by Cortron.
The keycaps are indeed double shot (including the spacebar!).
Notice the divots on the home row, similar to a certain Cortron keyboard I have (also branded Univac).
Anyways, enough talking, time for pics















































