1966 - an advertisement for WLBW-TV Channel 10 in Miami featuring the success of "Jumpin' Jack's Four O'Clock Club" show
National ad - Miami, Florida
Thank you to Duane Zimmerman for contributing this old image from the April 25, 1966, issue of Broadcasting magazine. Please click on "original" below to see the image at the largest size.
I remember 'Jumping' Jack O'Brian and the 4 O'Clock club. I also remember he used to do the commercials for Municipal Auto Sales. I think that the slogan was "Want the best - Shop for less at M.A.S.