1992 "M" 735i ??

Anyone know about a "M" class 735i being available in 1992. I am buying this car as it is just a nice example of '92 735i - the last year of the six cylinder 7 Series. This is coming to me from the original owner who ordered it configured this way from a California dealer. All original, it has performance suspension, upgraded BMW wheels & tires, etc. We all know BMW didn't do this, but maybe BMW NA did (like the L7s in '87) or was this just a dealer package? The owner is meticulous, having all records, and the window sticker lists this as "M735i" - is this just a marketing fantasy or what? Anyone know?? Thanks!