2 Francs - King Leopold I of Belgium and King Frederick William IV of Prussia

Neutral Moresnet was a peculiar administrative accident — a 1.4 square kilometer territory left stateless after the 1816 border commission between the Netherlands and Prussia failed to agree on its ownership, largely because both sides wanted control of a zinc mine at Altenberg. The territory lingered in legal limbo for over a century, jointly administered but belonging to neither state. This 1848 gold piece, struck with dual royal authority, is one of the vanishingly few numismatic artifacts acknowledging that arrangement in official coinage form.

The timing places it squarely within the revolutionary upheavals of 1848, when both Prussia and Belgium were managing domestic unrest.