Start with evidence. Record both sides, the edge, weight, diameter, holder, labels, and any provenance before cleaning, rubbing, dipping, or reorganizing the piece.
What establishes identity
Overdate diagnostics, die markers, wear, and certified attribution. The most reliable attribution combines visible design with denomination, date, mint or issuing authority, metal, diameter, weight, edge, orientation, and manufacturing style. A marketplace title can suggest a direction, but it does not replace attribution.
ReadCountry, ruler, date, denomination, legends, symbols, mintmark, designer initials.
MeasureWeight, diameter, thickness, edge, orientation, magnetism when appropriate.
CompareExact type, date, mint, variety, grade, certification, and problem status.
Condition questions that change value
Repeatable method: use the identification workflow, grading guide, authentication guide, and value guide. This page keeps the focus on evidence specific to this coin, series, variety, or collecting question.
- Does remaining luster move in a cartwheel pattern under rotating light?
- Are high points worn, softly struck, or flattened by damage?
- Do color and texture continue naturally into protected areas?
- Are rims, edge devices, and denticles consistent with the attributed type?
- Does the holder certification number verify with the stated service?
Authentication workflow
Value without fantasy
High-risk listing category: Famous rarities attract altered coins, counterfeits, replicas, misleading titles, copied images, and counterfeit holders. Strong certification and provenance are not optional details.