What NBA Finals featured two of the most storied franchises in the NBA who had faced each other six times in the 1960's?
1987 NBA Finals:  The Western Conference champion Los Angeles Lakers defeated the Eastern Conference and defending NBA champion Boston Celtics 4 games to 2. Celtics–Lakers rivalry:  They would both go on to dominate the league in the 1960s and 1980s, facing each other six times in the 1960s, three times in the 1980s, and two times in the late 2000s.
i don't know