Interesting Article about How Zimbabwe glues together old USD $1 bills
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USD $1 bills are in high demand in Zimbabwe, so some people make money glueing back together old bills that can be used in the market place.
I think the place I have been that used money for the longest time before replacing was India. There was some REALLY REALLY old small rupee notes in circulation. (Very grimy actually, and quite dirty).
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I found the same article with a couple of pictures.