Fred Rupnow, who often sends me links of interest, sent me to a piece by J. Kingston Pierce. Pierce thinks Harry O, which starred David Janssen, was the second-best "private eye" series ever done for television, eclipsed only by The Rockford Files. I would rank those shows in the other order but that's not one of those debates that's worth a whole lot of anyone's time…
…and even I might have a tough time deciding if it was just a matter of comparing the first two seasons of Rockford Files' six to the only two that were made of Harry O. Both of those seasons were put out on DVD several years ago but they're expensive and sometimes hard to find. I liked them a lot.