The most expensive banknote sold at auction is an 1890 United States $1,000 Treasury Note, which sold for $3.29 million (£2.6 million) at Heritage Auctions (USA) on 10 January 2014.
The note is known as the “Grand Watermelon” note, due to the three prominent zeros on the reverse that resemble the fruit. The notes are extremely rare, and only three specimens are available to collectors.
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History of Auctioneering
The most expensive seal sold at auction was sold for $22,000,000 (£17,595,777) and was bought by an anonymous buyer (China) in Paris, France, on 14 December 2016. The seal had once belonged to one of China’s longest serving emperors, Qianlong (1735-1796) of the Qing dynasty, who owned 1,800 of them. According to the auction house, the seal was acquired by a French naval doctor during a trip to China in the 19th century, after which it remained in his family.
Country: France
Year: 2106
Date: December 14
Source: https://www.guinnessworldrecords.com/world-records/456051-most-expensive-seal-sold-at-auction