Valuation Evidence
Valuation evidence is not simply a collection of prices. It is a body of information used to support a defined value conclusion for a particular object, purpose, market and date. A sale result may be precise but irrelevant. A dealer listing may be current but untested. A private transaction may be highly useful but impossible to verify. The task is to understand what each source proves.
Evidence becomes persuasive only when the subject item is identified accurately and the comparison is tested across edition, authenticity, condition, completeness, provenance, market setting and transaction terms. Similar-looking objects can belong to different value tiers, while apparently conflicting prices may simply answer different market questions.
A defensible valuation therefore records not only the evidence accepted, but also the examples rejected, the adjustments made, the uncertainty that remains and the reason some indicators received more weight than others. The conclusion should be reproducible as an argument, even when the market itself is incomplete.
Explore valuation evidence
Ten topics connect source discovery, transaction verification, comparability, adjustment, evidence quality and reconciliation.
Find and classify the evidence
Map the available sources, establish what actually happened and separate completed transactions from offers, opinions and research leads.
Build the comparison
Choose genuinely relevant examples, distinguish sold from asking evidence and describe differences before making any adjustment.
Judge limits and reconcile
Grade evidence quality, work carefully in thin markets and explain why apparently conflicting indicators do or do not belong in the conclusion.
Evidence supports a question; it does not create one
Before gathering prices, define the valuation purpose, effective date, relevant market and value basis. An insurance replacement value, an auction estimate, a dealer purchase offer and an estate-market conclusion can all use evidence from the same object while reaching different figures because they assume different transactions, costs, exposure and timeframes.
Evidence gathered without this frame tends to be mixed indiscriminately. Retail listings are compared with auction hammer prices, current offers with historical transactions and exceptional trophy results with ordinary examples. Precision in the numbers cannot correct a poorly defined question.
A defensible evidence sequence
1. Define the valuation assignment
Record the purpose, effective date, intended market, value basis, assumed transaction and any limiting conditions.
2. Establish the exact subject
Fix identity, edition, authenticity, condition, completeness, originality, provenance and the property interest being valued.
3. Search broadly
Gather completed sales, unsuccessful offerings, current listings, private transactions, archives, prior valuations and supporting object records.
4. Verify what each source proves
Confirm transaction status, object identity, price basis, fees, lot structure, date, venue, exposure and the reliability of the source.
5. Reject false comparables
Remove examples whose identity, state, market or transaction conditions are too different to answer the defined question.
6. Rank the remaining evidence
Separate direct verified evidence from adjustable evidence, contextual indicators, unsupported assertions and research leads.
7. Normalise before comparing
Translate hammer prices, buyer totals, dealer prices, bundles, currencies, dates and regional markets onto a consistent basis where possible.
8. Describe and support adjustments
Explain material differences before using a numeric, percentage, factor, qualitative or reduced-weight adjustment.
9. Reconcile rather than average
Give greater weight to the evidence that best matches the subject, purpose and market, and explain why conflicting indicators receive less weight.
10. State conclusion and confidence
Record the value or range, confidence level, assumptions, unresolved uncertainty and the evidence that would trigger review.
Comparability is multidimensional
The best comparable is not necessarily the object with the most similar title or appearance. It is the example that most closely matches the subject across the attributes that buyers in the relevant market actually reward or penalise. For one category, edition may dominate. For another, condition, completeness, attribution or association may matter more.
A comparison should therefore preserve both similarities and differences. When too many material differences require speculative adjustment, the example may remain useful as context but should no longer be treated as a primary comparable.
Distinctions that improve evidence decisions
A price and a transaction
A number may appear in a listing, catalogue or database without proving that a sale completed, was paid or involved the object described.
Asking evidence and sold evidence
Asking prices reveal seller positions and market testing. Completed sales reveal transactions, but only within their actual terms and exposure.
Hammer price and buyer cost
An auction hammer excludes premiums and sometimes taxes or shipping. The buyer's total and seller's net answer different questions.
Current and relevant
Recent evidence may come from the wrong market or object tier. Older evidence may remain more relevant if it is closely matched and transparently adjusted.
Scarce evidence and strong evidence
Evidence does not become stronger merely because little else exists. Thin markets require wider reasoning and clearer uncertainty, not lower standards.
Adjustment and invention
A supported difference can be recognised. A precise deduction without market support creates an appearance of certainty rather than evidence.
Conflict and incompatibility
Two figures may disagree because they describe different value bases, dates, markets or object states. They should be reconciled only after those differences are exposed.
Confidence and quantity
Ten weak listings do not necessarily outweigh one verified, closely matched transaction. Confidence depends on quality, convergence and market depth.
Worked example: four prices, one repaired first printing
A collector values a first-printing boxed game with a repaired box corner and one replaced paper component. The available evidence includes a $2,400 auction result for a complete unrestored first printing, a $3,100 dealer listing for a superior example, a reported $2,000 private sale with limited photographs and a $1,500 completed sale for a second printing in comparable cosmetic condition.
None of the four figures is the answer. The auction sale is direct but stronger in originality and completeness. The dealer listing shows a retail position but not an achieved transaction. The private sale may be useful if identity, payment and condition can be verified. The second printing is physically closer but belongs to a different edition tier.
A defensible conclusion would rank the evidence, preserve the edition premium, recognise the repair and replacement component without inventing a universal discount, and state a range reflecting the remaining uncertainty. Averaging all four prices would combine different evidence types while hiding the reasons they differ.
The evidence record should preserve the argument
Assignment
Purpose, value basis, effective date, market and assumed transaction.
Subject
Identity, condition, completeness, authenticity, provenance and inspection limits.
Source
Where the evidence came from, when it was accessed and whether it remains verifiable.
Transaction
Status, date, venue, lot structure, price basis, fees, terms and market exposure.
Comparability
Relevant similarities, material differences and the reason for inclusion or rejection.
Adjustment
Method, supporting rationale and the uncertainty created by any non-direct comparison.
Reconciliation
Weight assigned to each evidence class and explanation of conflicting indicators.
Conclusion
Value or range, confidence, assumptions, limitations and future review triggers.
Detailed Topics
Evidence Sources
Identify completed transactions, listings, archives, expert opinions and supporting object records, then judge the role each can play.
Comparable Examples
Select and rank examples by identity, condition, completeness, authenticity, provenance, market and transaction context.
Auction Results
Interpret hammer prices, premiums, passes, post-auction sales, lot structure, venue and bidder competition without treating every result as equivalent.
Dealer Listings & Retail Prices
Use dealer offerings and retail evidence with attention to market tier, service, listing history, unsold duration and transaction status.
Private Sales Evidence
Assess confidential and reported transactions by reconstructing identity, terms, verification, exposure and the motivations of the parties.
Sold Prices vs Asking Prices
Separate demonstrated transactions from current negotiation ranges and aspirational or untested market positions.
Adjusting Comparables
Account for supported differences in identity, condition, completeness, provenance, timing, venue, geography and sale structure.
Thin Markets
Build a reasoned conclusion where transactions, participants, venues, information or qualifying examples are scarce.
Evidence Quality
Grade evidence by transaction status, object identity, comparability, market relevance, transparency, independence and audit trail.
Conflicting Evidence
Reconcile factual, interpretive, market and conclusion conflicts without averaging incompatible evidence or hiding uncertainty.
Related Topics
Valuation Fundamentals
Define the valuation purpose, effective date, market and assumptions before selecting evidence.
Condition & Value
Understand how condition, completeness, originality and intervention affect comparability and market interpretation.
Rarity & Availability
Distinguish population scarcity, qualifying rarity, current availability and effective market supply.
Recording Valuations
Preserve the evidence, method, assumptions, confidence and version history behind a valuation conclusion.