From Wikipedia:
Here's Lucy is Lucille Ball's third network television sitcom. It ran on CBS from 1968 to 1974. Though The Lucy Show was still hugely popular during the previous (1967-68) season, finishing in the top five of the Nielsen Ratings (at #2), Ball opted to end that series at the end of that season and create a new show, as she had just sold Desilu Productions (which owned and produced The Lucy Show), to Gulf + Western. Ball did not wish to continue to star in a show that she no longer owned. Here's Lucy was produced by Ball's newly-created production company, Lucille Ball Productions. Desilu's successor Paramount Television (PTV) co-produced the first season, but sold its stake in the show to Ball afterwards. As a result, it is currently the only show starring Ball that is not owned by PTV's successor CBS Television Studios (PTV gained rights to her final show, Life with Lucy, after then-parent Viacom acquired co-producer Spelling Entertainment).
Created by Ray Singer
Starring
Lucille Ball
Gale Gordon
Lucie Arnaz
Desi Arnaz, Jr.
Mary Jane Croft
No. of seasons 6
No. of episodes 144
Producer(s)
Lucille Ball Productions
Cleo Smith
Tommy Thompson
Running time 30 minutes per episode
Original channel CBS
Original run 23 September 1968 – 18 March 1974