100 Ducat of Sigismund III Vasa (1621)
Country: Polish–Lithuanian Commonwealth
Sold: January 2018 for $2,160,000
Eagle on Globe Copper Pattern Quarter (1792)
Country: USA
Sold: January 2015 for $2,232,500
Chain Cent (1793)
Country: USA
Sold: January 2015 for $2,350,000
$4 Stella Coiled Hair (1880)
Country: USA
Sold: September 2013 for $2,574,000
Birch Cent (1792)
Country: USA
Sold: January 2015 for $2,585,000
Silver Ruble Pattern (1825)
Country: Russia
Sold: April 2015 for $2,585,000
Decadrachm (409-406 BC)
Country: Agrigentum
Sold: October 2012 for $2,918,000
Trade Dollar (1885)
Country: USA
Sold: January 2019 for $3,960,000
Single 9 Pond (1899)
Country: South Africa
Sold: May 2010 for $4,000,000
Queen Elizabeth II Million Dollar Coin (2007)
Country: Canada
Sold: June 2010 for $4,070,000
Q. Servilius Caepio (M. Junius) Brutus AV Aureus (42 BC)
Country: Roman Republic
Sold: October 2020 for $4,174,950
Liberty Head Nickel (1913)
Country: USA
Sold: August 2018 for $4,560,000
$10 Proof Eagle (1804)
Country: USA
Sold: January 2021 for $5,280,000
Umayyad Gold Dinar (723)
Country: Umayyad Caliphate
Sold: March 2019 for $6,029,400
Brasher Doubloon – EB on Breast (1787)
Country: Privately Minted
Sold: December 2011 for $7,395,000
Draped Bust Silver Dollar (1804)
Country: USA
Sold: August 2021 for $7,680,000
Half Eagle (1822)
Country: USA
Sold: March 2021 for $8,400,000
Brasher Doubloon – EB on Wing (1787)
Country: Privately Minted
Sold: January 2021 for $9,360,000
Flowing Hair Silver Dollar (1794)
Country: USA
Sold: January 2013 for $10,016,875
Saint-Gaudens Double Eagle (1933)
Country: USA
Sold: June 2021 for $18,900,000
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They're only valuable to people who collect coins. If no one wanted to buy them the value would be no more than the metal used to make them. Coins, stamps, paintings, items cast off by famous people, etc., their value, like anything, is subjective - what the buyer will pay.