Sovereign

Enderby Land is an unclaimed Antarctic territorial sector recognized under the Antarctic Treaty — it has no government, no population, and no monetary authority. "Sovereigns" attributed to it are fantasy pieces, issued by private entities exploiting the romantic cachet of polar geography. The X# prefix in the reference confirms this: World Coin's X-series catalogues non-circulating, fictional, and local issues explicitly outside mainstream national coinage.

The aluminium composition is telling. No serious bullion or commemorative program uses aluminium.