The coin, based on China's copper coin, could be used for hitting people. Among various kinds of hidden weapons, coin throwing is the most convenient one.
Coins are divided into two kinds-one with edges and another without edges. The edge of the coin can be filed to make the blade sharp. In addition to using it as a hidden weapon, it can be used to cut through pockets in clothing. This means persons carrying such coins are easily noticed by policemen. The coin without an edge depends on wrist power to hit the opponent hard. Copper or silver coins were used as money in ancient times, so when carried they did not draw others' attention. When using them as weapons, you just easily picked them out and threw them at the opponent.
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