20 Crowns Colonial Bank of Mauritius Bourbon and Dependencies

The Colonial Bank of Mauritius Bourbon and Dependencies was itself a product of the British seizure of Île de France in 1810, when the island — previously a French colonial possession and notorious base for privateers raiding East India Company shipping — was captured and renamed Mauritius. The bank operated briefly during the transitional decade before Crown Colony banking arrangements were formalized, and its notes circulated across both Mauritius and the neighboring Île Bourbon (Réunion), which Britain held only until 1815 before returning it to France under the Paris peace settlement.

The reversion of Bourbon to French control mid-series almost certainly disrupted the note's geographic circulation and likely contributed to early retirement of surviving stock.