When Mr Zheng got an 100 yuan ($16 dollars) note with a printing mistake three years ago, he never expected it would be worth a huge sum, according to a report of Chongqing Evening News on Thursday.

The imperfect 100-yuan banknote of Mr Zheng has an additional line in the portrait. [Chongqing Evening News]

The 100 yuan note features Chairman Mao Zedong on the front, just like any other RMB banknote. But what separates it from the others is a short line on the jaw of the portrait, right under the mole of the late leader.

It wasn't until recently that Zheng learned that a man in Guizhou province has a similar banknote worth one million yuan. So he brought his banknote to an auction house for evaluation, and was surprised to know the banknote is worth 1.5 million yuan ($240,000).

These imperfect banknotes are highly valued among collectors because of their rarity.

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