Here is a Golden Grain Macaroni and Cheddar commercial from the late 1960s and early 1970s which I captured from 16 millimeter film. This is from the same reel of film that has the La Choy Soy Sauce commercial. In addition, I left the countdown before the commercial, and the word “FINISH” (backwards and upside down) after the commercial. See this on YouTube here.
Some additional countdown items and finish