Rusty examples are the norm and are expensive to put right, I paid too much for this car 8 yrs ago but finding a 635 with zero rust was hard back then. I bought my first 6 series back in 1986 and had to put front wings on it then due to rust, this car has never seen a panel!

I was in traffic a couple of days ago and ended up sitting opposite a new shape 6 series, the owner sounded his horn and gave me the thumbs up.