1 Liberty Dollar Counterstamp on Mexico 1 Peso, 1901-05

In 1967, fed up with being administered from Saint Kitts with virtually no economic development to show for it, Anguillans expelled the Saint Kitts police force and declared independence — an act so improbable it is sometimes called the "Bay of Piglets." The provisional government needed currency immediately and had none, so it improvised: Mexican pesos from the 1901–1905 series were counterstamped and pressed into service. The host coins were decades old by then, already retired from Mexican circulation.

Britain eventually responded not with sanctions but with a near-comedic "invasion" of 300 paratroopers in 1969, finding no resistance whatsoever.