Ya. '83. That is an early imron color - look at the catalogs at vintage-trek.com.
model size serial range date
720 21 88005 88029 83
720 22 88030 88129 83
720 22 88130 88179 83
760 55 88180 88204 83
760 58 88205 88229 83
850 18 88230 88264 83
850 19 88265 88364 83
850 19 88365 88464 83
850 19 88465 88539 83
850 22 88540 88639 83
850 22 88640 88729 83
850 24 88730 88754 83
850 24 88755 88779 83
520 21 88780 88879 83
640 22 88880 88929 83
520 24 88930 89079 83

so...which model is it?