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

Banknotes 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

Coinage 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 cent1¢ 4.48 g 24.00 mm Cu (ring)Ag (plug) reeded 1792The first and only US bi-metallic coin until the 2000 Library of Congress ten dollar coin. Ring cent1¢ various weights90% Cu10% Ag1850–1851, 1853, 1884–1885196 ring cents (originals and restrikes) are known to exist. Examples exist with or without a hole. Aluminum cent1¢ 0.937 g 19.05 mm 96% Al4% 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. Two-cent billon2¢ 3.84 g ~13.00 mm 90% Cu10% Ag plain 1836 Two and a half cent piece2.5¢ unknown unknown unknown unknown never minted Proposed in 1916 by US mint director Robert W. Woolley.Civil War tokens of this denomination exist. Three-cent bronze3¢ 10.89 g 28.57 mm 95% Cu5% Zn plain 1863 Ring nickel5¢ plain 1884–1885 Gold ring half dollar50¢ 1852 Gold ring dollar$1 1849, 1852 Two dollar piece$2 unknown unknown unknown unknown never minted Proposed but not minted. Some privately struck renditions exist. Stella$4 7.00 g 22 mm 6.00g Au0.30g Ag0.70g Cu reeded 1879–1880 Half-union$50 83.58 g 50.80 mm 90% Au10% Cu reeded 1877 Commemorative coins of this denomination were issued in 1915. Several bullion coins are produced in this denomination.Union$100 unknown unknown 90% Au10% Cu unknown never minted Canceled before any patterns could be minted (fantasy coin shown). Some commemorative and bullion coins are minted in this denomination.

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