private stock aka the green death. Haven't heard that mentioned in ages .Honestly don't know if they still make it but from memory it was pretty bad but the bottle cap puzzle were fun. The more you drank the harder the got.
I HAVE HUNDREDS OF THE ORIGINAL CAPS... My friends who had no taste in beer use to take mill and bud bottles at the lake fill them half way with water and rap the top with palm of fist to knock out bottom and create a hollow bottle , then they would smash over head like a stunt man.. I got the bottom of the HAFFENREFFER and smashed over my head. but I was no stunt man got weak knees and almost passed out... ALMOST
According to Wikipedia, Private Stock was discontinued in 2013: https://en.wikipedia.org/wiki/Private_Stock_(malt_liquor)
My knowledge of heffenr..... allowed me to get served at 16 as I left the store with a case, told the guy stock up ill be back next week sold me some crappy beers 2 like bud miller