You sold her? Oh, No....

Yes it was eithe 1980 or 1981. By 1981, Motebecane was in bankruptcy, and they stopped making any changes in their bikes so both model years are pretty interchangeble. Both years had that gun metal gray color. The 1981 catalogue stopped putting down all the specs that would define the differences between the two years. Best way is to see if the bike had all the specs of the 1980 model which are clearly available, and if it was different, then it was the 1981 model. But you can only look at the frame. Other parts could have been changed by anyone between now and 32 years ago.