From Wikipedia:

Mr. Merlin is an American sitcom that ran for one season, from 1981 to 1982, about Merlin the wizard (played by Barnard Hughes), who is immortal, living in modern-day San Francisco, and disguised as Max Merlin, a mechanic. Mr. Merlin was produced by Larry Rosen and Larry Tucker, working as the Larry Larry Company, in association with Columbia Pictures Television.

The Wedlock / Cardinal font was used for the TV show logo and titles.