1 Koruna Československá

Tuzex was Czechoslovakia's state-run hard currency retail network — shops where citizens could buy Western goods unavailable through normal socialist distribution, but only by spending "bony," the non-convertible internal vouchers issued by Tuzex itself. This 1 Koruna note is one of those bony. The system was explicitly designed to siphon foreign currency remittances from Czechoslovaks abroad, converting hard currency into these scrip units before the state took its cut.

Printed by STC on the same presses that produced regular state currency, the bony carried enough visual authority to function as a parallel economy. Possession by ordinary citizens without a legitimate foreign income source was technically irregular, though by the 1970s a black market in bony was thoroughly entrenched.