Moday’s ad is for Bass Ale, from 1955. Bass Ale was one of the beers that helped push me away from the regional lagers I grew up drinking in Eastern Pennsylvania, and toward more flavorful beers. Jazz clubs in New York City in the late 1970s frequently carried Bass, and I really liked how different it tasted, compared to what I was used to. In this ad, when Bass had two pale ales, red triangle and blue triangle (the only difference being that red was bottle-conditioned while blue was not). So they’re apparently having a bicycle race to determine which triangle is the best. I’m not sure what the megaphones are for, however, that’s a bit of mystery.