The combination of "copper" and "penny" might not seem like the best formula for valuable coins considering that you can find higher denominations in gold and silver. But finding the right copper ...

Hong Kong had no currency of its own when it first became a British colony; it was using foreign currencies, such as Chinese copper coins and Mexican dollars. Ingots were not as convenient to use ...

the Japanese stopped making their own coins due to a lack of copper ore and economic changes. Sometimes, Chinese coins were used instead. So, it would not be surprising if many of the coins from ...