I believe it is the same as a D-66 (the D-66 may have been renamed the D-60, or vice versa).
I *think* the construction should be similar between D-55 & D-60/D-66. Spruce & rosewood, scalloped bracing. Differences should be mostly cosmetic, as I recall. The D-60/D-66 have slotted-diamond fret markers.
I've never played a D-55 from the 80's, but I have played a D-66 and it has a very warm, deep, resonant voice. More-recent D-55 examples that I've played (from Tacoma & New Hartford) sound more chimey or piano-like.
All are fine guitars . . . just different flavors re: their tones. Hope that helps.