Here is a clean, beginner-friendly guide to help you understand WHY this coin is so valuable and how to check if you might have one. 
Step 1: Why This 1980-S Dollar Is Worth Over $7 Million
1. Must Have the “S” Mint Mark
- Only coins from San Francisco (S) can qualify
- P or D mint marks automatically disqualify the coin
2. Rare Triple Error Combination
This single coin has three mint errors, making it historically unique:
- Double-Struck Obverse (visible doubling on portrait rim)
- Misaligned Die (about 15% off-center on the first or second strike)
- Broken Collar causing irregular reeding along the edge
3. Premium Proof Specifications
- Deep cameo mirror finish
- Frosted letters, date, and portrait
- Exact weight: 8.1 grams
- Must be graded PCGS PR-70DCAM
Step 2: How to Spot a Potential $7 Million Error Coin
1. Surface Inspection
Use a 10× magnifier and look for:
Dual concentric rings
Ghost-like second portrait
Slight obverse/reverse misalignment
2. Edge Examination
Look for:
Broken or uneven reeding
Thickness ranging 2.8–3.1 mm
No visible seams (seams = fake cast coin)
3. Weight & Size Test
Use a digital jeweler’s scale:
- 8.1 g ± 0.01g
- 26.5 mm diameter
- Center thickness: 2.0 mm
Step 3: Quick Comparison
| Feature | $7M Error Coin | Normal 1980 SBA Dollar |
|---|---|---|
| Strikes | Double struck | Single strike |
| Alignment | 15° misaligned | Perfect alignment |
| Edge | Irregular reeding | Uniform reeding |
| Luster | Deep cameo | Standard finish |
| Value | $7,115,000 | $1–$50 |
Step 4: Avoid Fakes – Common Counterfeits 
Be careful with replicas. Most online “rare errors” are fake.
Avoid coins with:
Electroplating (wrong weight)
Tool-marks on mint mark
Fuzzy details from casting
Step 5: Verified Authentication
If you think you’ve found a potential jackpot coin:
Submit to PCGS or NGC (Errors & Varieties Tier)
Request XRF metal composition test
Check provenance and previous ownership
Final Summary
The $7.1 million 1980-S Susan B. Anthony Dollar is a once-in-history combination of flawless proof condition and multiple error strikes. While nearly impossible to find, knowing the exact features helps collectors spot valuable coins — and avoid scams.
Every detail matters: mint mark, errors, condition, and certification.
