Canceled denominations of United States currency

The United States has several coins and banknotes which were proposed at one time but never adopted.

A three dollar bill was proposed two times during the 1860s. A design was engraved for a potential $3 United States Note, and a 1865 law called for a $3 National Bank Note, but neither proposal came to fruition.

Denomination	Obverse	Reverse	Notes
$3 note			Not to be confused with fake or privately issued obsolete notes or the three-dollar Continental currency banknotes issued during the American Revolution

There have been several United States coins which were proposed but never adopted. Most of the coins listed below, although never adopted, were produced in limited numbers as patterns.

Denomination	Obverse	Reverse	Weight	Diameter	Material	Edge	Minted	Notes
Silver center cent 1¢			4.48 g	24.00 mm	Cu (ring) Ag (plug)	reeded	1792	The first and only US bi-metallic coin until the 2000 Library of Congress ten dollar coin.
Ring cent 1¢			various weights		90% Cu	10% Ag[a]	1850–1851, 1853[b], 1884–1885	196 ring cents (originals and restrikes) are known to exist.[1] Examples exist with or without a hole.
Aluminum cent 1¢			0.937 g	19.05 mm	96% Al 4% trace metals	plain	1973–1975	1,579,324 coins dated 1974 were produced, but were not put in circulation and nearly all were later destroyed.[2]
Two-cent billon 2¢			3.84 g	~13.00 mm	90% Cu 10% Ag	plain	1836	[3]
Two and a half cent piece 2.5¢			unknown	unknown	unknown	unknown	never minted	Proposed in 1916 by US mint director Robert W. Woolley.[4] Civil War tokens of this denomination exist.
Three-cent bronze 3¢			10.89 g	28.57 mm	95% Cu 5% Zn	plain	1863
Ring nickel 5¢						plain	1884–1885	[5][6]
Gold ring half dollar 50¢							1852	[7]
Gold ring dollar $1							1849, 1852	[8][9]
Two dollar piece $2			unknown	unknown	unknown	unknown	never minted	Proposed but not minted.[10] Some privately struck renditions exist.[11]
Stella $4[12][13]			7.00 g	22 mm	6.00g Au 0.30g Ag 0.70g Cu	reeded	1879–1880	[14]
Half-union $50			83.58 g	50.80 mm	90% Au 10% Cu[c]	reeded	1877	Commemorative coins of this denomination were issued in 1915.[16] Several bullion coins are produced in this denomination.
Union $100			unknown	unknown	90% Au 10% Cu	unknown	never minted	Canceled before any patterns could be minted (fantasy coin shown). Some commemorative and bullion coins are minted in this denomination.

• Yeoman, R.S. (2014). Bressett, Kenneth (ed.). A Guide Book of United States Coins 2015 (68th ed.). Atlanta, Georgia: Whitman Publishing. ISBN 978-079484215-4. OCLC 875521690. OL 28306197M.