Saturday’s ad is for Genesee Beer, which was founded in Rochester, New York, originally along the Genesee River, but in 1878 they moved up into Rochester proper. Their Genesee Cream Ale, in the simple green can, was one of our go-to beers when I was in high school. Since 2009, the brewery has been part of North American Breweries. This ad, from 1969, features another full glass of beer with the weird foam. The background is a mountain stream, and given that the tagline is “Head Waters,” I guess they’re saying that’s where the weird foam comes from.