The Five Gold Ducats is a signature format used by the Czech Mint to issue commemorative "rounds" which are not legal tender. The coin is five times the size of the ducat, which follows the format of the first Czech ducat coinage, introduced at the beginning of the reign of King Charles IV, Holy Roman Emperor (in 1346). Because of their high fineness (23 1/2 carat) and stable weight (3.5 g) ducats soon became a basic gold nominal tender in most European countries. However, for lack of local raw material, the Czech ducat was not as widespread as for example the Hungarian ducat.
The ducat range includes a gold ducat, two ducats, five ducats and ten ducats. The Czech Mint also issues Silver Thalers.