I don't know about MB delivery times back then, but I did have a strange experience with them much more recently, in 1995, when I was interested in buying a New C coupe. When I asked the dealer, he told me there was a six-month waiting period for ... The brochure! The actual car could only be expected to be ready about a year after that. So I told him they would be better off not offering the car at all.
An American colleague just went through buying his first car in Switzerland. He described it as 'an ordeal', used as he is to be able to drive off the dealer's lot with a new car shortly after arriving there. This is one of the reasons I won't buy a new car anymore, in Europe you just don't know when you might be getting it, unless it happens to be in stock, which is rare. I'm just always happy someone else went through the ordeal when he or she bought the car that I am buying used, new.