I was wondering about this one the other day
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My father's favorite when I was pre-beer age (14)
The website says Pabst Brewing Company Irwindale, Ca.
Unless they have built another brewery in Irwindale, the only one I know of is sitting on top of Irwindale Raceway, and that was Miller Brewing when built.
I went on a tour of Olympia's brewery in the early 70s.
They were always so proud of their Artesian well water in their commercials.
Look out the window at the brewery, the Artesian well is full of ducks
.
So that's where it gets it's flavor
.
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Must be good if Parnelli Jones and Bill Stroppe have their names on it.