>>12243590They're Goldbacks. Utah and Nevada put laws on their books that allow them to use local currencies instead of Fedbux. A year or two later they came up with these.
Laminated gold leaf. The premium is retarded, and it's not a good way to stack gold, but they're a neat collector item and they have extremely small denoms of gold built in.
The artwork is beautiful. I only have Utah's at the moment.