5 Australes Rhenium

Rhenium is one of the rarest stable elements on Earth, with annual global production historically under 50 tonnes — making its use as a coinage metal essentially theatrical rather than monetary. The Falkland Islands issued this piece as a collector curiosity, exploiting the territory's nominal issuing authority to produce something no sovereign mint with practical constraints would sanction.

Rhenium's melting point of 3,186°C is the second highest of any element, which raises uncomfortable questions about how these were actually struck.