While most 1943 pennies were struck in zinc-coated steel due to copper shortages during World War II, a few copper pennies were minted in error. These rare coins can be worth thousands of dollars.
In 1974, a small number of aluminum pennies were struck as experimental pieces. These coins were never released into circulation and are highly sought after by collectors, with some examples fetching significant sums at auction.
Some 2007 Abigail Adams Presidential Dollars were struck with missing or doubled edge lettering, making them unique and valuable to collectors. These error coins can be worth hundreds to thousands of dollars.
The 1955 Doubled Die cent features a noticeable doubling of the lettering and date due to a misalignment of the die during minting. It is highly sought after by collectors and can be worth hundreds to thousands of dollars depending on its condition.
During World War II, the composition of US nickels was changed to include silver due to metal shortages. These "War Nickels" are easily distinguishable by the large mint mark above Monticello on the reverse side. While not particularly rare, their silver content makes them more valuable than regular nickels.
Part of the Statehood quarter series, the 2008 Arizona quarter features an extra saguaro cactus on the reverse side, resulting from a die variety. This error coin is highly collectible due to its rarity and unique appearance.
Similar to the 1955 Doubled Die cent, the 1969-S Doubled Die penny exhibits noticeable doubling on the lettering and date. It is rare and valuable, with examples in good condition fetching high prices from collectors.
In 1970, a small number of Lincoln cents were minted with a smaller date font. These "Small Date" coins are rare and valuable, especially in high grades.
Similar to the 2004 Wisconsin Extra Leaf Quarter, this error coin features an extra leaf on the ear of corn on the reverse side but with the leaf positioned lower. It is a rare variation of the original error and is highly sought after by collectors.
Minted in 2005 at the Philadelphia Mint, this Jefferson nickel features a die clash error that resulted in a spear-like projection appearing above the bison on the reverse side. Examples of this error coin command high prices in the collector's market.