The base currency of the United States is the U.S. dollar. Since 1946 it has been printed in seven denominations: $1, $2, $5, $10, $20, $50, and $100, however there used to be larger denominations.
Some notes, including this one, could be redeemed in gold coin as stated on the bill.
PCGSCoinFacts.com offers information to all collectors of United States coins, including thousands of full color coin images, rarity, and historical information
This coin was issued in two different varieties, one made of silver and one made of nickel.
A twenty-cent piece had been proposed as early as 1791, and again in 1806, but had been rejected.
Minted for only three years, the usefulness of this denomination seemed limited.