Jon,I remember taking a liking to dark beer in high school, early to mid ‘70s. San Francisco Bay Area. Heineken, Lowenbrau and San Miguel all made dark beer. I wondered why nobody in America made such a thing. Then we discovered Anchor Steam. It was an epiphany. Besides the standard steam beer they made a porter that I still like today.
I grew up in the SF bay area too (Santa Clara Valley) and the mentioned beers provoke found memories. Heineken dark was my favorite, but alas they stopped making it. PBR- used to offer a dark Bock beer that they would release every fall. As kids we were told that this beer was bottled from the bottom of the vats, which they cleaned annually in the fall, hence the dark and rich taste. We were gullible back then.