This is from season 1 of Mannix which aired in the 1967-68 season (totaling 24 episodes). This intro has a few elements that are in stark contrast to later seasons; the "Mannix" title is a computer printout, playing off the fact that Joe Mannix worked at Intertect, the high-tech detective agency, and Joseph Campanella as the Lew Wickersham character is second-billing rather than Gail Fisher as Peggy (who joins the series in the season 2 premiere).
More info at http://www.rerund.com/mannix-1967-75/
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Contrary to what many people who saw Mike Connors' classic P.I. series Mannix in syndication may...