History
Hammered coins were produced by placing a blank piece of metal (a planchet or flan) of the correct weight between two dies, and then striking the upper die with a hammer to produce the required image on both sides. The planchet was usually cast from a mold. The bottom die (sometimes called the anvil die) was usually counter sunk in a log or other sturdy surface and was called a pile. (This may be related to the modern term pile driver). One of the minters held the die for the other side (called the trussel), in his hand while it was struck either by himself or an assistant.
In later history, in order to increase the production of coins, hammered coins were sometimes produced from strips of metal of the correct thickness, from which the coins were subsequently cut out. Both methods of producing hammered coins meant that it was difficult to produce coins of a regular diameter. Coins were liable to suffer from "clipping" where unscrupulous people would remove slivers of precious metal since it was difficult to determine the correct diameter of the coin.
Coins were also vulnerable to "sweating," which is when silver coins would be placed in a bag that would be vigorously shaken. This would produce silver dust, which could later be removed from the bag.
Read more about this topic: Hammered Coinage
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