Bench seat that doesn't fold forward

[Gigem]

I was talking to an upholsterer today about recovering or replacing the bench seat in my 1980 today. He mentioned that mine was the first he had seen that had a bench seat that was rigid/not hinged. Does not fold forward to allow access behind the seat.

He seemed to know what he was talking about, but who knows? So I am curious, do most bench seats fold forward?

I know that my seat is original, as it had a build sheet in the springs that had info on it that matches the vehicles VIN...