Thinking about buying or selling a 1990-D Washington Quarter with an error? 
 You’re not alone—collectors love these coins, but the market is full of fakes and exaggerated claims. This guide will help you spot authentic errors, know their true value, and avoid costly mistakes.
 Key Details: How to Tell If Your 1990-D Error Quarter Is Real
 Most Common 1990-D Error Types
 Double Die Mint Mark (D/D) – Extremely rare, valuable 
 Die Clash on Eagle’s Wing – Seen more often, lower value
 Red Flags to Watch Out For
 No certification from PCGS or NGC
 Vague descriptions like “lightly circulated” with no details
 Stock photos instead of actual coin images
 Overhyped phrases like “ULTRA RARE!”
 Real-World Value Breakdown
| Error Type | Certified Coin Value | Raw (Uncertified) Value |
|---|---|---|
| Double Die Mint Mark (D/D) | $300 – $1,500 | $50 – $200 |
| Wing Die Clash | $50 – $150 | $10 – $30 |
| Verified Combo Errors | $500+ | $100 – $300 |
 Expert Tip: Most “double die” coins you see online are actually machine doubling (flat, shelf-like marks). Real doubled dies show clear separation lines under a 10x magnifier.
 How to Spot a Real Error Coin
 Mint Mark Verification
- Use a 10x loupe or magnifier
- Real D/D shows distinct separation lines
- Compare your coin with PCGS CoinFacts images
 Die Clash Identification
- Look for a mirrored eagle wing impression on the front side
 Weight & Size Check
- Correct weight:Â 5.67 grams
- Diameter:Â 24.26 mm
 Buyer Beware: Signs of a Bad Listing
Avoid any seller that:
 Doesn’t provide PCGS/NGC certification
 Uses stock photos or blurry images
 Refuses returns
 Uses hype terms like “double die super rare” without close-up proof
 Smarter Buying Tips
 Shop certified coins at Heritage Auctions
 Stick with trusted dealers like Liberty Coin
 Verify listings through CoinCommunity forums
 Free Bonus: Quarter Error Checklist
Want a quick guide to spotting genuine vs. fake quarter errors? 
 Download our Free Quarter Error Checklist to keep handy when browsing coins online or at shows!
