That should be the last year I believe that you'll find that on the inside of the cover. I think they had to make sure they got their moneys worth!
For a part this old to fix on a bike 15(?) yrs later, some one had to draw this up and plan it out when the new bike was being designed ... They even had to know that this part still existed in the supply line ... MV still exists today? Maybe that part is not so old ... Is that the clutch housing? Maybe that clutch is copied from a modern day MV machine? I'd guess these motors were all drawn out on the boards while MV was still on board and bwm had no or little say in these designs as apposed to the 449s and street Huskies ...