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1969 • 14 Episodes
Season 1 of Special Branch premiered on September 17, 1969
1970 • 13 Episodes
Season 2 of Special Branch premiered on August 11, 1970
1973 • 13 Episodes
Season 3 of Special Branch premiered on April 4, 1973
1974 • 13 Episodes
Season 4 of Special Branch premiered on February 14, 1974