Claims of a single Bicentennial quarter being worth nearly $50 million USD and five more worth over $750,000 each would be highly extraordinary and would likely require substantial evidence and authentication to be taken seriously by the numismatic community.
The 1913 Liberty Head Nickel: One of the most famous and valuable coins in the world, with only five known specimens. In 2018, one of these nickels sold for over $4.5 million USD.
The 1804 Draped Bust Dollar: Despite its date, the 1804 Draped Bust Dollar was not actually minted in 1804 but rather in the 1830s.
The 1933 Double Eagle: As previously mentioned, the 1933 Double Eagle is one of the most famous and valuable coins in the world. In 2002, one specimen sold for over $7.5 million USD.
The 1794 Flowing Hair Silver Dollar: Another rarity in the numismatic world, with only around 150 known specimens. In 2013, one example sold for over $10 million USD.
The 1787 Brasher Doubloon: One of the earliest American coins, with only a few known specimens. In 2011, one example sold for over $7.4 million USD.