The Organization of East Caribbean States (OECS) is an eleven-member intergovernmental organization dedicated to the economic harmonization and integration, encouragement of good governance, and the protection of human and legal rights between countries and territories in Eastern Caribbean. Antigua and Barbuda, the Commonwealth of Dominica, Grenada, Montserrat, St. Kitts and Nevis, Saint Lucia and St. Vincent, and the Grenadines are full member states of the organization, while the British Virgin Islands, Anguilla, Martinique, and Guadeloupe are associate members. The OECS was established after the Eastern Caribbean States signed the Treaty of Basseterre on June 18, 1981.
The Organization of East Caribbean States use the East Caribbean dollar. The only members that do not use the East Caribbean dollar as the official currency—Martinique and the British Virgin Islands. Martinique is still considered a part of France and officially uses the euro, while the British Virgin Isles officially uses the US dollar. The East Caribbean dollar replaced the British West Indies dollar in 1965. The East Caribbean Central Bank issues and circulates the banknotes. Because many of the East Caribbean states were part of the British Caribbean territories, their banknotes all feature different portraits of Queen Elizabeth II from different points in her reign, and the printer of their banknotes is the De La Rue Company.