The British West Indies was a name for all British colonies in the Caribbean Region. For centuries, Spanish Dollars (pieces of eight as they were called) were used. Between 1820 and 1822, fractional dollar coins were minted for the West Indies, Guyana and Mauritius in denominations of 1/16, 1/8, 1/4 and 1/2 Dollar, in line with Spanish colonial Real coins ( 8 Reales = 1 Dollar). These coins were named 'anchor money' as they featured an anchor.
Over the years, the British sought to unify the currency usage of these places and launched the British West Indies Dollar or BWI$ in 1935 at a rate of 4s2d per BWI$ or 4.80 BWI Dollars per sterling. Among its users were Jamaica (in parallel with Sterling), Caymans, Turks & Caicos, British Virgin Islands (but quickly reverted back to USD), St Kitts & Nevis, Montserrat, Anguilla, Antigua & Barbuda, Dominica, St Vincent & the Grenadines, St Lucia, Barbados, Trinidad & Tobago and British Guyana.
In 1955 coins were introduced of 1/2, 1, 2, 5, 10, 25 & 50 cents. The BWI$ was also the currency of the short-lived West Indies Federation from 1958 to 1962. Many territories left and introduced their own Dollars and the BWI$ was transformed into East Caribbean Dollar that is still used today in St Kitts & Nevis, Antigua & Barbuda, Anguilla, Montserrat, St Vincent, Dominica and St Lucia. The EC$ is pegged to USD at 2.70 EC$, which is still about 10% higher value than if it would have stayed within the sterling area.
The islands mentioned above did issue non-circulating commemorative coins, but have no independent currencies of their own.
BWI anchor money:
https://en.numista.com/catalogue/british-west-indies-1.html
East Caribbean states (including British era):
https://en.numista.com/catalogue/oeco-1.html
