3 Dollars - Elizabeth II Manilla

The manilla was a horseshoe-shaped copper or bronze bracelet currency used across West Africa for centuries, functioning as a medium of exchange in trade networks — including, infamously, the transatlantic slave trade, where European merchants paid for enslaved people in manillas by the thousands. Britain's Royal Mint was itself a significant supplier of manillas to West African markets into the twentieth century, continuing production at Llantrisant as late as 1949.

This silver issue is part of a broader Royal Mint program commemorating obsolete currency forms. The manilla's last official demonetization occurred in Nigeria in 1948, when the colonial government withdrew an estimated 32 million pieces from circulation.