1987 or 1988 ... virtually identical ...Both years had those parts and that color "aqua'...
the only significant diferance was the wheel; 1987 had Weinman.. 1988 had Araya.
Shifter was a slightly different model and the saddles were dif. but your saddles been changed. a particurly nice bike, Heavy Duty, DB CHROMO, straight-up rig... very strong.