Did they make 1975 450SELs that were not 6.9?
They most certainly did. You're looking at a W116 chassis car - the 70's S class. Most of these cars were powered by the 4.5 liter M117 engine - it had somewhere in the neighborhood of 180 h.p. (as compared to around 280 for the 6.9). Although they made a few hundred 6.9's in '75, I don't think 6.9's were sold in this country until 1977. 6.9's are super expensive to maintain, so I've got to agree Hill on that one. However, the people on this forum who have even the regular 450SEL seem to love them. You may want to view this long thread here.