Doris Day '69 Ragtop

If that is a California black plate that matches the car and television show I would assume the California DMV could provide some help. The car more than likely would have been registered to a studio at that time and is used in the opening sequence in the show and appears to be San Francisco.
Yeah, tried CA DMV, real PITA. I think I might be able to get somewhere if I was there in person, but they won't give me anything over the phone. I'll keep trying, next step might be request by mail, but everyone is real touchy about personal info nowadays. Just found some info on the dealership and PR outfit that provided the Chryslers to the shows...fingers crossed.