Attribute Obverse, Reverse, and Legend
2-4 hours per coinTranscribe visible legends, identify portrait style, and match deity or architectural reverse types to reference catalogs.
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Ancient Coin Research Guide
Complete guide for ancient coin research — step-by-step workflow, tools, checklist, and expert tips to get started.
ancient coin fanshistorians
Workflow
Measure Weight, Diameter, and Metal Test
30 minutesWeigh to 0.01 g, measure diameter with calipers, and compare to expected standard for attributed issue.
Evaluate Style, Patina, and Tooling Marks
1 hourCompare fabric, centering, and patina to auction archives — modern fakes show uniform sand-blasted surfaces.
Document Provenance and Historical Context
1-2 hoursRecord auction house, hoard source, and historical ruler context; add citations from BMC or Sear references.
Tools Used
- NotepadPrimary
Document attribution chain, weight measurements, provenance sources, and bibliographic references for each ancient coin.
- Carat Weight ConverterPrimary
Convert measured coin weight to expected ancient standard denominations for authenticity verification.
- Age CalculatorSupporting
Calculate reign dates and coin issue windows from ruler attribution for historical context.
- Image CompressorReference
Archive high-resolution obverse and reverse images for comparison with auction catalog plates.
Checklist
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Research
Verification
Documentation
Authentication
Compliance
Finance
Reference Materials
Roman Denomination WeightsTable
Target weights for common Roman silver denominations (ideal mint state).
| Denomination | Metal | Target Weight |
|---|---|---|
| Denarius | Silver | 3.6–3.9 g |
| Antoninianus | Billon | 3.0–3.5 g |
| Aureus | Gold | 7.0–8.0 g |
| Sestertius | Orichalcum | 25–28 g |
Authenticity Weight CheckFormula
Attributed issue valid if measured weight within ±5% of catalog standard after accounting for wear loss.
Due Diligence StandardStandard
Purchase only with return privilege until independent attribution confirmed — ancient fakes flood online markets.
Buy Attribution
Pay modest premium for dealer-attributed coins while learning — self-attribution errors are costly.
Patina Tells Time
Natural patina is uneven and embedded — applied patina wipes off with acetone test on inconspicuous spot.
Too Cheap
Silver denarii under $30 are almost always fakes — if price seems impossible, walk away.
Safety Notes
- Handle coins by their edges — ancient surfaces are fragile and patina loss destroys value.
- Verify import and export compliance for ancient coins — UNESCO guidelines apply to some origins.