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这些便士钱币是伦敦一家制币厂铸造的。
图1：凹版印刷的效果：真币(左)和复制币(右)。
Figure 1. Effect of intaglio printing: authentic banknote (left) and copied note (right).
自从1979年推出高纯度枫叶金币以来， 加拿大皇家制币厂已经售出20万盎司的金币。
Since 1979, the mint has pioneered high-purity Maple Leaf bullion coins, selling about 20 million ounces of them around the world.
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