Save this post. Every coin listed below has been VERIFIED and SOLD.
These are not rumors, guesses, or “maybe” coins — these are real mint errors that passed certification and brought huge money at auction.
If you collect pennies, quarters, or dollar coins, this list is critical 
2000 Penny Struck on a New Hampshire Quarter – SOLD for $9,400
This error should never exist.
Why It’s Valuable
- A Lincoln cent design struck on a state quarter planchet
- Incorrect size, weight, and metal
- Fully authenticated mint error
Final Sale Price: $9,400
Tip: Check coins that look the wrong size for their design.
1999 Penny with Foreign Letters on Reverse – $50,000+
Look closely near the word “UNITED.”
What Went Wrong
- Letters from another coin design appear on the reverse
- Mint error caused by clashed or incorrect dies
- One of the most dramatic penny errors known
Estimated Value: $50,000 and UP
2001-D Penny with Roosevelt Dime Reverse – SOLD for $78,000
Yes — a penny with a dime back.
Error Details
- Obverse: Lincoln cent
- Reverse: Roosevelt dime
- Struck at the Denver Mint
- One of the rarest mule errors ever found
Sold in 2025 for: $78,000
1999 Penny with Dime Reverse – SOLD for $138,000
This is a legendary mule error.
Why Collectors Went Crazy
- Two completely different coin designs
- Penny obverse + dime reverse
- Extremely low survival count
Final Sale Price: $138,000
Quarter Struck on a Sacagawea Dollar – SOLD for $144,000
A quarter that shouldn’t be gold-colored.
What to Look For
- Quarter design
- Sacagawea dollar planchet
- Wrong metal, weight, and diameter
Auction Result: $144,000
Sacagawea Dollar Struck on a Presidential Dollar – SOLD for $84,000
Two different dollar coins — one massive error.
Error Breakdown
- Sacagawea design
- Presidential dollar planchet
- Certified and verified mint mistake
Sold for: $84,000
Why These Coins Are So Valuable
All are certified mint errors
All are documented and verified
All have real auction sale records
Errors involve wrong planchets or mule designs
Important: These values only apply to authenticated coins graded by PCGS or NGC.
Before You Spend Any Coin — Do This
Check the weight
Compare size and color
Inspect both sides carefully
Look for designs that don’t match
Never clean the coin
Send it for professional grading
Final Thought
Some of the most valuable coins ever sold were found by regular people who simply stopped and looked.
One coin
One mistake
One life-changing discovery
Don’t ignore your change.
