Coin collecting, or numismatics, is a fascinating blend of history, artistry, and the excitement of finding. Among the most thrilling finds for collectors are error coins—unique pieces born from mistakes during the minting process. These errors can turn ordinary coins into extraordinary treasures worth thousands or even millions. Here’s a closer look at three famous error coins that have captured the hearts (and wallets) of collectors worldwide.
2008 Undated 20p Mule Coin
In 2008, the Royal Mint introduced a new design for the 20p coin, featuring the Royal Shield of Arms. During this transition, a major minting error occurred: approximately 250,000 coins were struck without a date. This was the first time in over 300 years that a British coin lacked a date, making the 2008 undated 20p a historical anomaly and a collector’s dream.
Why It’s Valuable:
- Error: The coins feature mismatched obverse and reverse dies, leaving them dateless.
- Rarity: With only 250,000 estimated in circulation, they are highly sought after.
- Value: Currently worth up to £72 or more, depending on condition.
Notable Sales:
Undated 20p coins have fetched impressive prices in online auctions, especially on platforms like eBay.
How to Spot It:
Check your 20p coins for the absence of a date on either side—this rare feature can significantly boost its value.
1969-S Doubled Die Lincoln Cent
The 1969-S Lincoln cent is one of the most famous error coins in U.S. history, thanks to a dramatic “doubled die” error. This type of error occurs when the coin’s design elements appear duplicated due to a misalignment during the hubbing process. Initially mistaken for counterfeits, these coins were later authenticated and have since become iconic among collectors.
Why It’s Valuable:
- Error: Noticeable doubling on the date and obverse inscriptions, including “LIBERTY.”
- Rarity: Only around 30 examples are known to exist.
- Value: Commands up to $37,200 or more at auction, depending on condition.
Notable Characteristics:
The 1969-S doubled die penny typically features a satiny chestnut-brown surface and clear, bold doubling, making it unmistakable.
How to Spot It:
Examine the obverse closely, especially the date and inscriptions. If you notice doubling, you may have stumbled upon one of the rarest Lincoln cents ever minted.
2000 Sacagawea Dollar/Washington Quarter Mule
Perhaps one of the most intriguing minting mistakes, the 2000 Sacagawea dollar/Washington quarter mule coin is a rare hybrid created when dies for two different coins were accidentally paired. This mishap produced a coin with the obverse of a Washington quarter and the reverse of a Sacagawea dollar, making it a true numismatic gem.
Why It’s Valuable:
- Error: A “mule” coin combining mismatched dies from two denominations.
- Rarity: Only about 18 specimens are known to exist.
- Value: Worth up to $155,250 or more, depending on condition.
Notable Sales:
A specimen of this mule coin fetched $155,250 at auction in August 2012, reflecting its unparalleled rarity.
How to Spot It:
Inspect coins carefully for mismatched designs—if you find this mule, it’s a jackpot for any collector.
| Coin | Error Type | Estimated Mintage | Current Value | Key Features |
|---|---|---|---|---|
| 2008 Undated 20p Mule | Missing date | ~250,000 | Up to £72+ | Dateless due to mismatched dies |
| 1969-S Doubled Die Lincoln Cent | Doubled die on obverse | ~30 | Up to $37,200+ | Doubling on date and inscriptions |
| 2000 Sacagawea Dollar Mule | Mismatched obverse/reverse | ~18 | Up to $155,250+ | Obverse of quarter, reverse of dollar |
Error coins represent the perfect blend of rarity and mystery, offering collectors the chance to own truly unique pieces of history. The 2008 undated 20p mule, the 1969-S doubled die Lincoln cent, and the 2000 Sacagawea dollar/Washington quarter mule are prime examples of minting mishaps that became treasures. Keep a close eye on your loose change—you never know when you might stumble across one of these valuable errors.
FAQs
What makes the 2008 20p coin valuable?
It lacks a date due to mismatched dies, making it rare.
How rare is the 1969-S doubled die cent?
Only about 30 examples are known to exist.
What is a mule coin?
A coin struck with dies from two different denominations.
How much is the 2000 Sacagawea mule coin worth?
Up to $155,250 or more, depending on its condition.
Where can I sell error coins?
Auction sites like eBay or coin auctions are good options.
