Looks like POP-2 from 1968 also had multiple return values. Lisp Machine Lisp is claimed to be the first Lisp to have that feature (end 70s), from where Common

Looks like POP-2 from 1968 also had multiple return values. Lisp Machine Lisp is claimed to be the first Lisp to have that feature (end 70s), from where Common Lisp got it.