Hello Olaf,
Vinyl covering on the pagoda hardtop is clearly not original. It was fashionable in the late 60ies and early 70ies. However, both MB (and I) disliked that completely and they said that vinyl-covered hardtops (or tops in general) or non-Mercedes-like.
It's clearly custom-made.
Best,
Achim
(Magdeburg, Germany)