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
Bag marks, cabinet friction, hairlines, porosity, corrosion, scratches, and planchet flaws. 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?
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Authentication workflow
Value without fantasy
Collector standard
Write down what you observed separately from what a seller, previous collector, price guide, or online post claimed. That distinction makes future correction possible.
Related research
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