10 000 Francs CFA Courtesan

Chad's BEAC membership technically restricts it from issuing independent coinage, which is precisely why these large-format collector pieces are routed through private minting agreements rather than the central bank. The "Courtesan" belongs to a category of numismatic curiosities that exist primarily because Pacific and African nominal issuers will license their sovereignty for a fee — the coin has no realistic path to Chad, let alone circulation there.

The composite construction — silver plating over a zinc-copper core — is worth noting for storage: zinc cores of this mass are prone to long-term expansion and plating stress if humidity is not controlled.