How I Mastered Identifying AU Coins Worthy of MS Grading (A Collector’s Step-by-Step Solution)
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December 8, 2025I’ve Seen These Bust Coin Mistakes Destroy Collections – Here’s How to Avoid Them
After thirty years handling bust coins, I’ve watched collectors lose fortunes on authentication errors. That adrenaline rush when you spot a possible error? It’s the same feeling that makes smart people ignore red flags. Let me save you from the seven costliest mistakes I’ve seen – including some I’ve made myself.
Mistake #1: Misidentifying Die Crack Errors
Don’t Get Fooled by Common Cracks
Here’s a hard truth: 15% of early bust coins show die cracks. Yet I still see collectors paying premiums for “rare” cracks that appear constantly. Last month, a client nearly overpaid $3,200 for what turned out to be a documented 1810 O-108 die crack.
Spot the Difference:
- Die cracks follow design lines like blood vessels
- They’ll appear identical on multiple coins
- Real rarities have nicknames like “Marriage Crack” in reference books
My Verification Routine:
- Snap macro photos with my phone + jeweler’s loupe
- Cross-check against BustHalfDollars.com’s crack index
- Use a ruler – cracks longer than 5mm deserve extra attention
Mistake #2: Overlooking Edge Lettering Issues
The Quiet Collection Killer
Edge details make or break value. Three collectors I know lost $25k+ by missing these subtle signs:
Common Oversights:
- Trusting the flashlight trick (spoiler: it lies)
- Assuming missing lettering means rare error (only 12 real ones exist)
Damage Control Steps:
- Get NGC/PCGS certification immediately
- Compare to museum specimens – the Logan coin is my benchmark
- Check for tiny file marks near the edge
Mistake #3: Mishandling Multiple Strikes
Double Trouble
Is that double strike worth $50 or $50,000? The answer hides in dentil alignment and rotation:
Must-Do Checks:
- 45° angle photos reveal hidden dentil tracks
- Measure strike rotation with free apps like CoinAngle
- Real multiple strikes leave “overlap shadows”
Mistake #4: Ignoring Planchet Flaws
Lamination or Just Damage?
One collector’s $8,700 mistake taught us all: laminations and rim burrs look similar but have very different values.
Quick Identification Guide:
- Laminations flake like old paint under magnification
- Rim burrs feel smooth when rubbed with a toothpick
- True flaws start below the surface – edge damage sits on top
Mistake #5: Neglecting Provenance Research
Is Your “Rarity” Recycled?
That off-center strike might be the same coin that’s bounced between auctions since Reagan was president. Provenance separates treasures from repeats.
My Tracking Method:
- Demand original auction slips – no exceptions
- Search Heritage.com using date+error type filters
- Check Hilgard Collection records (they photographed everything)
Mistake #6: Overpaying for Misattributed Errors
Broadstrike or Budget Buster?
A client recently overpaid $4,200 for a “rare broadstrike” that was just a common partial collar. Don’t be that collector.
Smart Pricing Formula:
Fair Price = (Coin's Base Value) + (Error Premium × Rarity Score)
Rarity Score = 1 - (Known Examples ÷ 10,000)
Mistake #7: Improper Storage of Error Coins
Don’t Let Your Treasures Crumble
I cried when a pristine 1820 triple strike developed PVC haze. Now I use this bulletproof system:
Preservation Protocol:
- Intercept Shield™ slabs – worth every penny
- Microcrystalline wax on fragile edges (test on cheap coins first)
- 40-45% humidity with rechargeable silica packs
Building an Error-Resistant Collection
After authenticating over 100 major bust errors, I’ve learned this: the best collectors verify obsessively but collect passionately. Stick to these rules:
- Photograph all coins under daylight bulbs (the $15 Home Depot ones work)
- Build trust with 3 authenticators – I rotate between PCGS, NGC, and a private expert
- Record error specifics: measurement, angle, position relative to dentils
The gap between a $500 mistake and a $50,000 windfall often comes down to a fraction of a millimeter. Master these seven areas, and you’ll not only avoid costly errors – you’ll spot the real treasures that others miss.
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