Oh, I saw this. It's been re-listed at least once. The crazy stagger of the bottom row is wacky as well.
Also, I think it might be KXNA.
I see the 12/73 on the xerox logo, but I'd be more willing to believe the 8919 on the cherry logo. Last I checked cherry didn't have many KB's in 1973, nor xerox computers (1973 did see the xerox alto, but it didn't use this KB. I think it may have used honeywell hall effect.)