Stuiver 'Cayenne-Stuiver' Countermark C20 + fleur-de-lis

When French Guiana's copper-billon stuivers flooded the Caribbean in the early nineteenth century, colonial administrators on Sint Maarten faced the familiar problem of authenticating foreign specie for local circulation. The dual countermark — combining a C20 denomination stamp with a fleur-de-lis — was applied by Dutch colonial authority around 1820 specifically to validate these so-called Cayenne stuivers, originally struck in Cayenne for French Guianese use, as accepted currency on the Dutch half of the island.

The absence of a KM number reflects how thinly documented this issue remains in mainstream references. Scholten and the CNO catalogue it; most others don't.