Termination of validity of CZK banknotes
As of 30 June 2022, the validity of the older versionsof the CZK 100 - CZK 2,000 banknotes with thin silvery thread will be terminated. As of 1 July 2022, these banknotes can no longer be used for payment. The exchange of invalid banknotes will be possible at the cash desk in banks and at Czech National Bank offices.
More information you can find here.