Due to a scarcity of copper during the war, the majority of 1943 pennies were cast from steel. There was also a 1943 copper wheat penny. But a handful of copper pennies were mistakenly struck and are now collectors' items, selling for more than $100,000.
A minting mistake caused the wording and date on this 1955 Double Die Penny to appear twice. Its value ranges from a few hundred to several thousand dollars due to its strong collector status.
In 2004 On the back of some Wisconsin state quarters, you may see an additional leaf on the corn ear. The value of these mistake coins might vary from several hundred to more than a thousand dollars.
There is a variant of the 1972 Eisenhower Dollar (Type 2) that does not have the mint mark "S" on the front. Because of its scarcity, this kind can fetch prices much beyond its market value.
A highly sought-after mistake coin, the 1995 Double Die Lincoln Cent features obvious doubling on the date and text.
A minting mistake on this 1970s Proof Washington Quarter, which features a duplicated die obverse, can increase its value by several hundred dollars.
In 2005 A few Kansas state quarters were struck with the slogan "In God We Rust" rather than the more common "In God We Trust." Because of the mistake, they might be worth more than what they seem.
From 1942 to 1945 Nickels with Silver Components: Nickels with silver components were used in WWII. These coins are more valuable to collectors than they are worth at face value due to the silver they contain.