***This is an Uncirculated 20 Colones banknote dated 1983 from Costa Rica which was printed on Tyvek.The prices of Tyvek banknotes have gone up tremendously these last few years as only several countries had ever printed banknotes on the now defunct tyvek technology and the last time it was used was more than 25 years ago.
Tyvek was pioneered by the Americans to replace the paper technology but was found to be unsuitable shortly thereafter and was totally killed off with the discovery of the very durable polymer technology by the Australians.
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