Another thread
here
Seems like Stein of Moggok shouldn't be in at release, but "a Glowing Stein" which can be completed by any class (seems like quest was different, easier? Didn't have the faction component to it). In August 1999 they nerfed the quest and created Stein of Moggok as reward.
Is possible all existing Glowing Steins converted to a 1hb type Stein of Moggok, but quest ones weren't?
Someone who cares more than me please dig.