I just want to be clear: you are saying that the berserker subclass existed at the time the 1st edition AD&D Monster Manual came out and that the berserker in that book was a representation of that class?Berserkers were an NPC subclass of fighter related to barbarians in 1e. They were in the Dragon Magazine as an NPC class, but in the 1e era where rules varied wildly from table to table, I can and did see Berserkers played as PCs. In 2e Berserkers were a PC kit. And in 3e it was a prestige class.