Thanks everyone for the responses- I appreciate the insight! I do have to agree that it seems odd that MTM would carry that logo from 1970-73, especially given it hadn't started as BW, but I have read that on various websites (although, those places probably got their info from same place).
Thanks to all of the experts on opening and closing logos who post here. I've become curious about the CBS "presents this program in color" logo. I have read that NBC discontinued use of the NBC "in living color" peacock on 12/31/1975, but I haven't determined or read how/when CBS retired the...