Just to clarify the point on the World Series broadcasts, they are mostly but not fully intact from 1969 on and break down this way as far as the NBC color tape masters go.
1969-Games 3,4,5 (Games 1 and 2 exist as CBC B/W Kinescopes)
1970-Game 5 (Games 1 through 4 exist as CBC B/W Kinescopes)
1971-Games 1,2,6,7. The middle games only exist in partial form.
1972-Only Game 4 in full and a near complete Game 5. The MLB Vault has partials for all other Games except 7. There is a compilation clip tape with highlights from all seven games that originated in Canada.
1973-Only Game 1. We have near completes for Games 2, 3, and 7. Smaller partials for Games 4 and 5 and nothing of Game 6. However 1973 is the earliest year of World Series telecast footage recorded off-air by a home taper using a "Cartridgevision" device and some other sections of the games such as Game 6 survive from these recordings. This same Cartridgevision taper incidentally also recorded the entire Game 5 of the 1973 NBA Finals which was restored and aired on MSG Network a few months ago showing the clinching game of the last championship of the New York Knicks.
1974-All complete except for Game 5 which is missing the first couple innings and the last couple innings and postgame.
1975-99% complete. Only a small inconsequential part of Game 5 is missing.
The CBC preserved in full in B/W all games of the 1965 and 1968 World Series.