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Re:How Greece became a two currency economy by gus_massa on Tuesday January 26, 2016 @01:17PM (#10974871)
There was a similar situation in Argentina in 2001. It was possible to convert 1 peso to 1 dollar automatically. Formally they were two different currencies, but in practice they were equivalent, until ...

More info: https://en.wikipedia.org/wiki/Corralito