The Coupés from the midsize series (from front to back) are the Coupés from the W124 series (1987 to 1996), W123 series (1976 to 1985) and W114 series (1968 to 1976)

Personal note: growing up in New Zealand some friends of my parents had a W114 250CE which, as a child, I thought was very special indeed. They had a bad accident in it but a tribute to Mercedes safety engineering, they walked away with a few bruises though the car was damaged beyond repair. They replaced it with a Series 3 Jaguar XJ6