I think that's a W108 or 109, made, clearly, for the pope
300SEL 6.3 #2723, my first classic Benz3.5 #8659, my second.2 to go...
Hi Paul,
I stumbled across this picture of what appears to be a 600SWB Landaulet, with rear facing seats, and thought you might be interested.
https://static01.nyt.com/images/2013/03/24/automobiles/Pope2/Pope2-superJumbo.jpg?quality=75&auto=webp
1970 300SEL 6.3