The Delta 88 was the base model from 1969 (when the Delmont 88 was discontinued) to 1982 (When the base Delta 88 was dropped). The "Royale" was the high line 88 from 1969 through 1978. In 1979 the "Royale Brougham" interior option debuted. It basically consisted of "loose cushion" look seatbacks and "98" caliber fabrics.
And those 98 fabrics... that was luxury! ;)
/first car was a 1980 Oldsmobile 98 Regency