Could your 1999 penny be hiding six-figure value in your spare change? After 6 years of saving, one collector discovered a 1999 penny worth over $100,000 due to an ultra-rare die clash mule error. Here’s how to find it 
How to Spot the Rare 1999
Why the 1999 Die Clash Mule Penny Is So Valuable
The Error:
- “UNITED” lettering appears on the obverse (front) where it shouldn’t
- Caused by a die clash (coin dies smashed together without a planchet)
Rarity: Only 1–2 confirmed examples exist (PCGS-certified)
Record Sales: Similar die clash errors have sold for $100,000+
How to Spot the $100K Penny in 3 Steps
Check the Year
- Must be 1999, Philadelphia or Denver mint
Examine the Obverse
- Tilt the penny under bright light
- Look for faint “UNITED” lettering near Lincoln’s shoulder
Compare to a Normal 1999 Penny
- Normal coins have no extra lettering
Pro Tip: Use a 10× magnifier for the best results
Other Valuable 1999 Penny Errors
| Error Type | Value Range |
|---|---|
| Wide AM | $500–$5,000 |
| Doubled Die Obverse | $1,000–$10,000 |
| Off-Center Strike | $50–$1,000 |
What to Do if You Find One
Don’t Clean It!
- Cleaning can destroy the coin’s value.
Get It Graded
- Submit to PCGS or NGC ($50–$150 fee) for authentication
Sell Strategically
- Heritage Auctions for six-figure coins
- Private collectors for faster sales
Pro Tip: Check your 1999 pennies now—don’t spend them by mistake!
