Value and VIN location on 73 Duster with fold down rear seat

Unless someone did some serious work to a 70-72 car, putting a fold down rear seat in a car with all the factory components is a chore.

My guess is it is a 73+ car.

Thanks crackedback, sounds logical, do you know if the VIN near the rear speaker deck shelf would still be in the same spot with a rear folding seat?