The 1–70 scale
U.S. coins are commonly described on the Sheldon scale. Circulated grades run from heavily worn PO-1 through AU-58. Mint State business strikes use MS-60 through MS-70. Proof coins use a proof prefix such as PR.
Uncirculated does not mean perfect.A coin can have no circulation wear and still show contact marks, a weak strike, or poor eye appeal.
What graders study
- Wear: loss of detail on the highest points.
- Strike: how completely the dies formed the design.
- Luster: light moving across original metal flow lines.
- Marks and surfaces: contact marks, scratches, corrosion, cleaning, or other damage.
- Eye appeal: the overall visual impression, including color and balance.
Estimate in the right order
Identify the exact issue first. Compare your coin with issue-specific photo standards under consistent light. Look for wear before judging marks, and inspect both sides. Some designs strike weakly even when uncirculated.
Grading remains subjective. Coin AI provides a photo-based estimate, not a certification. Consider professional authentication and grading when the likely value could justify the fee or when authenticity is uncertain.