If you collect coins beyond pocket change, grading is the single biggest factor in determining value.
A 1916-D Mercury Dime in AG-3 might be worth $800. The same coin in MS-65 could sell for over $30,000. Understanding how grading works helps you buy smarter, sell fairly, and insure accurately.
The Sheldon Scale
Nearly all modern coin grading uses the Sheldon scale, a 1-to-70 numeric system.
Here's a simplified breakdown:
| Grade Range | Label | What It Means | |---|---|---| | 1 | Poor | Barely identifiable as a coin. Date and type may be unreadable. | | 4 | About Good | Heavily worn, but the design is outlined. | | 8-12 | Good to Fine | Moderate to heavy wear. Major details are visible. | | 20-35 | Very Fine | Light wear on high points. Most detail remains. | | 40-45 | Extremely Fine | Slight wear on the highest points only. | | 50-58 | About Uncirculated | Trace wear. Often looks uncirculated at first glance. | | 60-70 | Mint State | No wear at all. The range covers bag marks, luster, and strike quality. |
Proof coins use a parallel scale prefixed with "PF" (for example, PF-70 is a flawless proof).
PCGS vs NGC
The two dominant third-party grading services are PCGS and NGC.
PCGS (Professional Coin Grading Service) is often considered the gold standard for US coins. Their holders (slabs) tend to command slight premiums at auction.
NGC (Numismatic Guaranty Corporation) is equally respected, especially for world coins. NGC holders are slightly larger and show more of the coin's edge.
Both assign numeric grades, authenticate the coin, and encapsulate it in a tamper-evident holder with a certification number.
Why Grade Matters for Your Inventory
When you log coins in your collection, recording the grade directly impacts three things:
Insurance coverage. An insurer needs to know if your Morgan Dollar is VF-30 or MS-64. The value difference can be 10x or more.
Resale accuracy. Buyers want to know the grade upfront. Certified coins sell faster and at higher prices.
Collection tracking. Watching your collection's average grade over time tells you whether you're upgrading or just accumulating.
Certified vs Raw
"Raw" coins are ungraded and unslabbed. Their value depends entirely on the buyer's assessment, which means more negotiation and more risk. Certified coins have an objective third-party opinion sealed in plastic.
For high-value coins, certification is almost always worth the cost.
For common-date coins in circulated grades, the grading fee may exceed the value premium. In those cases, it's fine to keep them raw and log your own estimated grade.
Tracking Grades in Your Inventory
For each coin, record the following:
- Grade. For example: MS-65, VF-30, or PF-69.
- Grading service. PCGS, NGC, ANACS, ICG, or self-assessed.
- Certification number. If slabbed, this lets anyone verify the grade online.
- Variety notes. DDO, RPM, or other die varieties that affect value.
This data, combined with photos, gives you a complete record for insurance, sales, and personal reference.