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using molds. This method of coin production continued in China into the nineteenth century. Up to a couple of dozen coins could be produced at one time from a single mold, when a 'tree' of coins (which often contained features such as a square hole in the center) would be produced and the individual
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suggests that a lower die could be expected to last for up to 10,000 strikes depending on the level of wear deemed acceptable. Upper dies seem to have a far greater range of lives with usable lives ranging from just over 100 strikes to nearly 8000 being reported. Combining archaeological evidence
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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
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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.
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in the 1560s, but while machine-produced coins were experimentally produced at intervals over the next century, the production of hammered coins did not finally end until 1662.
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A furnace for producing molten metal for coin production.
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