10 Korun Československých

Tuzex was a state-run foreign currency network that allowed Czechoslovak citizens to purchase Western goods — electronics, clothing, alcohol, blue jeans — that were simply unavailable through normal retail channels. The bony, as Tuzex vouchers were colloquially known, were not legal tender and could not be obtained with ordinary crowns; they required hard foreign currency or official allocation, which immediately created a black market premium.

By the mid-1960s, acquiring bony through unofficial channels carried real legal risk, yet the trade flourished because the goods on the other side of the Tuzex counter were otherwise inaccessible to most Czechoslovaks. The voucher system was, in effect, a parallel economy operating under state sanction.