I think it is a bit earlier . . .
by the late '60s and early '70s woodgrain plastics had become a big, big thing. This design is much cleaner with no fake wood. I'd guess early to mid '60s. I have a later Philco unit with a woodgrain front and "garage door" flip over panel in front of the controls. I'm not sure of the age but I think it is '70s. It still works well!