7 Coins with Hidden Features Only Experts Know About 

Coins might have subtle design aspects or secret systems. Here are seven coins with intriguing secret properties only specialists know.  

The 1974 Aluminium Cent was delayed due to composition concerns. Parliamentarians received several struck specimens. These coins are prized for their low weight and unique metallic composition.  

USA 1974 Aluminium  Cent  

Famous and valuable coins include the 1933 Double Eagle. Simple design, yet rareness is its secret. Most of these coins were melted before issuance due to currency legislation changes, making the remaining examples rare and valuable.  

USA 1933 Double Eagle  

The 1955 Doubled Die Penny has an erroneous obverse doubling effect. Doubling during minting creates a unique and desirable kind.  

USA 1955 Double Die Penny

World War II copper shortages forced the U.S. Mint to make zinc-coated steel pennies in 1943. That year, strange copper coins were minted by mistake. Weight and metal content define copper pennies.  

USA 1943 Copper Penny  

U.S. Mint created Cheerios-sponsored Sacagawea dollar coin in 2000. The reverse side of these coins displays a unique eagle tail feather motif. These coins fascinate collectors due to their limited distribution.  

USA 2000 "P" Cheerios Dollar  

In 2005, a die error on Kansas state quarters distorted the slogan "In God We Trust" to "In God We Rust." These defective coins are rare and prized by collectors.  

USA 2005 Kansas Quarter "In God We Rust  

On the back of the 2013 Royal Mint £1 coin is the Coat of Arms. The coin's edge micro-lettering says "DECUS ET TUTAMEN," Latin for "An ornament and a safeguard." Experts know this secret feature. The security function prevents counterfeiting.  

The 2013 UK "Royal Coat of Arms" £1 Coin  


7 Coin Collecting Myths That Could Mislead New Collectors