The "V-6" part of the Volvo logo with a solid bar between each letter. V-O-L-V-O.
Maybe not. I've been looking at images of late 60s and early 70s Volvo sedans and none of them have the bar between the letters of the "Volvo". It probably does say V-6. Seeing the tail lights would be the best indicator.
Nixon resigned on August 8, 1974, so it could be anything late 60s (although the squared-off body style is certainly more 1970s) up to a 1975 model year.