coin
Let an agent handle coins by issuer, denomination, series, metal, legal tender status, authenticity and collecting, without investment advice.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent handle coins by issuer, denomination, series, metal, legal tender status, authenticity and collecting, without investment advice.
A small, flat, usually round piece of metal issued by a government or authority as money, with a face value, design and inscriptions; also produced as commemorative and bullion pieces and collected in numismatics.
What it is for: Cash payment, store of value and collecting.
It can be identify coins by issuer and year; check legal tender status; detect likely counterfeits; value coins using catalogues.
Distinguishing features
Issued by an authority
Face value
Minted metal
Collectible
What it looks like
Metal discs with portraits, emblems, inscriptions and edges that may be milled or lettered.
How it is recognised
Denomination, year and mint mark
Obverse and reverse designs
Tokens and medals are not currency
Related models
is a kind of - category
is issued by - issuer
is studied in - field
is contrasted with - other cash
In practice
Families and kinds
circulating coins
commemorative coins
bullion coins
historical and ancient coins
error coins
Identifiers
KM number Krause catalogue coin types
Standards and regulation
Coinage and legal tender laws
Counterfeiting laws
Export rules for antiquities
Failure modes and hazards
Counterfeit coins
Illegally excavated ancient coins
Agents giving investment advice
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Identity Which coin.
Details identify.
Issuer
Country and year.
Issuer
Issuer and year.
- Which issuer, denomination and year is it? provenance
- What is its catalogue number? provenance
Status
Legal tender.
Status
Legal tender status.
- Is it still legal tender? provenance
- Can withdrawn coins be exchanged? provenance
Authenticity Genuine or not.
Fakes exist.
Checks
Weight and details.
Checks
Authenticity checks.
- Do weight, diameter and details match official specifications? measurement
- Should an expert or grading service check it? action
Report
Counterfeits.
Report
Suspected counterfeits.
- What should someone do with a suspected counterfeit coin? action
- Which authority should be told? provenance
Collecting Numismatics.
Collectors need sources.
Value
Catalogues.
Value
Catalogue value.
- What is its catalogue value in this grade? measurement
- Is the user asking for investment advice? boundary
Care
Handling.
Care
Coin care.
- How should coins be handled and stored? action
- Why should they not be cleaned? boundary
Heritage Ancient coins.
Law protects heritage.
Finds
Reporting.
Finds
Coin finds.
- Must a found hoard or ancient coin be reported here? provenance
- To which authority? provenance
Trade
Provenance.
Trade
Trade provenance.
- Does this ancient coin have documented legal provenance? boundary
- Which export rules apply? provenance
What the second pass must settle
- Should coin series be separate entries?
- How should catalogue numbers be linked?
- How should ancient coins be handled legally?