Klippe (coin)
Encyclopedia
A klippe is a square coin minted on more easily produced square flans
Planchet
A planchet is a round metal disk that is ready to be struck as a coin. An older word for planchet is flan. They are also referred to as blanks.-History:The preparation of the flan or planchet has varied over the years...

 either using round or square dies
Die (manufacturing)
A die is a specialized tool used in manufacturing industries to cut or shape material using a press. Like molds, dies are generally customized to the item they are used to create...

. These coins were originally issued under unfavourable conditions, such as a city under siege
Siege
A siege is a military blockade of a city or fortress with the intent of conquering by attrition or assault. The term derives from sedere, Latin for "to sit". Generally speaking, siege warfare is a form of constant, low intensity conflict characterized by one party holding a strong, static...

. Such emergency coinage were issued in Vienna in 1529, while the city was besieged by the troops of the Ottoman Empire. However, by the seventeenth century, klippe were also commonly produced as presentation pieces.
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