Between the mix of campy/sach/gipiemmi components that are on there now, it is highly likely that someone changed out some of the parts at one time. THe sachs components were somewhat of a budget concession that makes sense on a lower tier aelle frame, they are probably original to the bike.
The '85 sticker is for a Bottechia winning the the Italian national championships, the 89 sticker for Lemond winning world championships. Is there perhaps another sticker to commemorate the 89 TDF win?