While most 1943 Lincoln cents are made of zinc-coated steel due to the shortage of copper during World War II, a small number were mistakenly minted in bronze. These bronze cents are extremely rare and can fetch high prices at auctions, with some selling for hundreds of thousands of dollars.
A small number of 2007 Presidential dollars were minted without the motto "In God We Trust" on the edge. This error was quickly corrected, making the "Godless" version highly sought after by collectors. They can command significant premiums in the numismatic market.
In 1983, the Royal Mint accidentally produced a small number of 2p coins with the inscription "New Pence" instead of "Two Pence." While not exceedingly rare, these error coins are still sought after by collectors, especially those in uncirculated condition.
Issued to commemorate the 2008 Beijing Olympics, some variations of this coin feature an error where the Olympic logo appears as five interlocking rings instead of the correct representation. These error coins are highly coveted by collectors due to their rarity and association with a significant global event.
In 1999, an error occurred at the Royal Australian Mint where the obverse die for the 10-cent coin was mistakenly paired with the reverse die for the $1 coin, creating a hybrid or "mule" coin. These coins are scarce and can command high prices among collectors.
A small number of 1970-S proof quarters were minted with a doubled die obverse, resulting in distinct doubling of the date and other features. These varieties are highly sought after by collectors of error coins and can fetch significant premiums.
The 1948 one-rupee coin from India is known for its unique design featuring a star below the national emblem on the obverse side. Due to its low mintage and historical significance (being issued shortly after India gained independence), this coin is highly sought after by collectors of Indian numismatics.