In the Original they were also called "Hubbucks" (the hub being the largest city) I believe the idea was they were also stamped with the city's symbol.Kevdamon said:bottlecaps are probably the weirdest.. since it's post apocalypse, I'd figured they'd use something more tangible... like food or water or something like that..
but bottlecaps are good too I guess
Edit: from the fallout wiki "Bottle caps are backed by The Hub merchants in the Core Region. The reasoning for their support is that the technology to manufacture bottle caps and paint the surface has been lost in the Great War, which would greatly limit any counterfeiting efforts. Secondly, there is a limited number of bottle caps, which would serve to preserve their value to some degree."