20 Cedis Aliens, Colourized

Ghana's "Aliens" series belongs to a wave of sub-Saharan mint programs that emerged after the Royal Mint of Holland and later the Mautner Markart group began actively courting African central banks into the numismatic collectibles market in the 2010s. The Bank of Ghana has issued under this arrangement with relatively little domestic circulation intent — these are hard-currency earners, priced in euros and dollars before they reach any Ghanaian collector.

The colourization was applied after striking, a finish that tends to deteriorate under UV exposure over decades — a longevity question the secondary market has not yet had to answer.