Here is an easy, step-by-step guide to help you understand why this quarter is so valuable — and how to check your own coins. 
Step 1: Why This Quarter Reached $10.2 Million
1. Perfect MS-70 Grade (Flawless Condition)
- Only 2 known examples exist
- No marks, flaws, or contact lines even under 10× magnification
- Surfaces are perfect, with full original mint shimmer
2. Ultra-Rare “Super High Leaf” Variety
- A unique extra leaf on the corn stalk
- Leaf is raised so high that it touches the main stalk
- Only 3 confirmed coins with this specific variety
3. Premium Mint Luster
- Straight from sealed mint rolls
- Features golden-orange rainbow toning that collectors highly prize
4. Strong Historical Importance
- Came from the original Wisconsin quarter proof set
- Personally reviewed by the Mint Director
Step 2: How to Identify a Potential Million-Dollar Wisconsin Quarter
Check your coin carefully for these features:
Authenticity Checklist
Extra High Leaf touching the corn stalk
Razor-sharp edges with no scratches or dents
Full rainbow-toned luster
Weight should be exactly 5.67 grams
Must be certified by PCGS or NGC to have real value
Step 3: Reality Check Before Getting Too Excited 
Most 2005 Wisconsin quarters are only worth 25¢.
However, these versions do have real market value:
MS-69 Grade Coins: $50,000 – $100,000
Misprinted “SOMILLION” Errors: Value depends on certification
Double-Struck Errors: Can sell for $250,000+
While the $10.2 million example is extremely rare, valuable variations still exist.
Step 4: What to Do If You Think You Found a Rare One
Follow this process:
Do not clean the coin — this destroys value
Use archival gloves to handle it safely
Take close-up, high-resolution photos
Submit the coin to PCGS or NGC for authentication
If it seems promising, contact Sotheby’s or Heritage Auctions for private sale options
Final Summary
A simple mint variety turned the 2005 Wisconsin Extra Leaf High quarter into a $10.2 million coin — the most valuable state quarter ever sold. Knowing what to look for can help every collector spot valuable variations hiding in ordinary pocket change.
Coin values rise on rarity, condition, and certification, and this legendary quarter is the perfect example.
