| name | collection-valuation-guide |
| description | Provides valuation methods, market reference sources, and pricing frameworks for collectible items. Covers market comparison analysis, auction result interpretation, price guide usage, dealer appraisal processes, and valuation documentation for personal, insurance, and sale purposes.
Use when the user asks about determining the value of a collection, understanding collectible market prices, comparing valuation methods, or preparing a collection for sale or insurance documentation.
Do NOT use for authenticating collectibles (use collectible-authentication-guide), cataloguing inventory (use collection-inventory-builder), financial investment advice on collectibles, or professional appraisals for legal proceedings.
|
| license | Apache-2.0 |
| metadata | {"author":"foundry-skills","version":"1.0.0","tags":"research analysis guide checklist","category":"hobbies-crafts","subcategory":"collecting","depends":"","disclaimer":"none","difficulty":"intermediate"} |
Collection Valuation Guide
When to Use
Use this skill when:
- User asks about determining the value of collectible items
- User wants to understand how collectible pricing works
- User needs to compare valuation methods (market comps, auction results, price guides, dealer appraisals)
- User is preparing a collection for sale, insurance, or estate purposes
- User asks about current market conditions for a collectible category
- User mentions wanting to know what their collection is worth
Do NOT use when:
- User needs to verify authenticity before valuation (use
collectible-authentication-guide first)
- User needs inventory or cataloguing help (use
collection-inventory-builder)
- User asks about collectibles as a financial investment strategy (this is collecting, not investing)
- User needs a certified appraisal for legal proceedings (requires a licensed appraiser)
- User asks about counterfeit currency valuation (law enforcement matter)
Process
-
Identify the valuation context. Ask the user for:
- Collection type: coins, stamps, trading cards, comics, art, memorabilia, watches, records, books, etc.
- Specific items to value: individual high-value pieces, entire collection, or representative sample
- Valuation purpose: personal curiosity, insurance coverage, sale preparation, estate settlement, donation tax deduction
- Condition information: has the collection been graded, or is it ungraded with self-assessed condition
- Authentication status: has authenticity been verified for high-value items
- Timeline: how quickly does the user need the valuation
-
Explain the four valuation methods. Present each method with trade-offs:
Method 1: Market Comparison (Comps)
- How it works: Find recent sales of the same or very similar items and use those prices as value indicators
- Best sources: Completed auction listings (not active listings -- asking prices are not market values), dealer sales records, collector community sale reports
- Strengths: Most accurate reflection of what buyers actually pay; accounts for current market conditions
- Weaknesses: Requires finding comparable items (rare items may have few comps); prices vary by condition, so exact condition matching is critical
- How to use comps effectively:
- Find 3-5 completed sales of the same item in the same condition
- Discard the highest and lowest prices (remove outliers)
- Average the remaining prices for a fair market estimate
- Note the sale dates: prices from over 12 months ago may not reflect current market
Method 2: Auction Results
- How it works: Review results from established auction houses that specialize in the collectible category
- Strengths: Transparent pricing, verifiable results, competitive bidding often reflects true market interest
- Weaknesses: Auction prices include buyer's premiums (typically 15-25% above hammer price); rare items at major auctions may achieve higher prices than private sales due to auction excitement
- Important distinctions:
- Hammer price: what the winning bidder bid
- Buyer's premium: additional percentage charged by the auction house (typically 15-25%)
- Total price realized: hammer price + buyer's premium (this is what the buyer paid)
Output Format
## Collection Valuation Report
### Collection Overview
| Parameter | Value |
|----------------------|------------------------------------|
| Collection type | [Type] |
| Total items | [Number] |
| Valuation purpose | [Insurance / Sale / Estate / Personal] |
| Value type | [FMV / Replacement / Liquidation] |
| Valuation date | [Date] |
### Valuation Method Summary
| Method | Used For | Weight |
|---------------------|-----------------------|------------------|
| Market comps | [Tier A items] | [Primary/Secondary] |
| Auction results | [Rare items] | [Primary/Secondary] |
| Price guides | [Tier B items] | [Primary/Secondary] |
| Dealer appraisal | [Confirmation] | [Primary/Secondary] |
### Tier A: Individual High-Value Items
| Item | Condition | Auth? | Method | Comparable Sales | Est. Value |
|---------------|-----------|-------|----------|-----------------|------------|
| [Item 1] | [Grade] | [Y/N] | [Method] | [Sales cited] | $[Value] |
| [Item 2] | [Grade] | [Y/N] | [Method] | [Sales cited] | $[Value] |
| **Tier A Total** | | | | | **$[Sum]** |
### Tier B: Mid-Value Items
| Category | Items | Method | Est. Range | Est. Total |
|------------------|-------|------------|-----------------|--------------|
| [Category 1] | [N] | Price guide| $[low]-$[high] | $[Estimate] |
| [Category 2] | [N] | Price guide| $[low]-$[high] | $[Estimate] |
| **Tier B Total** | | | | **$[Sum]** |
### Tier C: Common/Bulk Items
| Description | Items | Method | Est. Total |
|-----------------------|-------|-----------|----------------|
| [Bulk description] | [N] | Lot est. | $[Estimate] |
| **Tier C Total** | | | **$[Sum]** |
### Collection Total
| Tier | Value |
|--------|----------------|
| Tier A | $[Sum] |
| Tier B | $[Sum] |
| Tier C | $[Sum] |
| **Total** | **$[Grand total]** |
### Value Context
- Value type: [FMV / Replacement / Liquidation]
- Market trend: [Appreciating / Stable / Declining] for this category
- Confidence: [High / Moderate / Low]
- Next update recommended: [Date]
### Recommended Actions
1. [Action based on purpose]
2. [Action based on purpose]
Rules
- NEVER provide a specific dollar value for an item without citing the valuation method and data sources used -- unsupported numbers are meaningless
- ALWAYS distinguish between the value type being estimated (FMV, replacement, liquidation) -- the same item has different values depending on the context
- ALWAYS recommend authenticating high-value items before valuation -- an unauthenticated item cannot be reliably valued
- Price guide values must be discounted by 20-40% for realistic private sale estimates -- guide values are not transaction prices
- Auction results must distinguish between hammer price and total price realized (including buyer's premium)
- Dealer purchase offers are not market value -- dealers buy below market to resell at a profit
- NEVER recommend selling high-value items without first obtaining multiple valuation opinions
- Condition is the single largest value determinant for most collectibles -- a one-grade difference can change value by 50-200%
- Market values change over time: always note the date of valuation and recommend periodic updates
- Liquidation value is typically 40-70% of FMV -- users planning quick sales should expect significantly less than reference prices
- For collections worth over $5,000, always recommend a written professional appraisal for insurance purposes
Edge Cases
-
User has items they cannot identify: Valuation requires identification first. Recommend starting with the collection-inventory-builder skill to catalogue and identify items. For unidentified items, photograph them clearly (front, back, any markings) and consult a specialist dealer or collector community for identification. Value estimation can only follow identification.
-
User has a collection that appears mostly worthless: Most collections have a small percentage of items that hold the majority of the value. Focus the triage process on identifying those few items. Common items in average condition often have minimal resale value regardless of sentimental attachment. Be direct but respectful: "Based on current market data, the majority of these items have minimal resale value ($1-5 each), but items X, Y, and Z may have significant value and are worth individual research."
-
User wants to value a recently deceased relative's collection for estate purposes: Handle with sensitivity. FMV at date of death is the legal standard for estate valuation in most jurisdictions. Recommend a formal written appraisal for collections that may exceed estate tax thresholds. Advise against selling immediately unless required -- grief and urgency often lead to undervaluing. Connect with an estate attorney for jurisdiction-specific requirements.
-
User's collection has items in multiple categories: Valuation methods differ by category. Group items by type and apply the appropriate method for each group. The total collection value is the sum of category subtotals. Some items may cross categories (e.g., a signed first-edition book involves book valuation + autograph valuation).
-
User found items at a thrift store and wonders if they are valuable: Start with identification and authentication before valuation. Thrift store finds are occasionally valuable, but most items are common. Check for any identifying marks, dates, signatures, or labels. Compare to reference materials. If the item appears potentially valuable, the investment in professional authentication (typically $20-75) is worthwhile before assuming value.
Example
Input: "My dad collected coins for 40 years. He passed away last year and I inherited about 500 coins. I don't know much about coins but I need to figure out what the collection is worth for estate purposes and eventually decide what to do with it."
Output:
Collection Valuation Report
Collection Overview
| Parameter | Value |
|---|
| Collection type | Coins (U.S. and possibly world) |
| Total items | ~500 coins |
| Valuation purpose | Estate settlement + future disposition |
| Value type | Fair Market Value (FMV) at date of death |
| Valuation date | [Current date -- but estate FMV should be pegged to date of death] |
Recommended Approach for a 500-Coin Inherited Collection
Given the estate context, here is the step-by-step process:
Step 1: Triage the Collection (Time: 2-3 hours)
Sort all 500 coins into three tiers. You do not need to be a coin expert for this step.
| Tier | How to Identify | Expected % of collection |
|---|
| A | Gold coins, silver dollars, coins in individual holders with notes, coins in certified slabs (hard plastic cases with labels), anything that looks old (pre-1900) | 5-15% (~25-75 coins) |
| B | Silver coins (pre-1965 U.S. dimes, quarters, half-dollars are 90% silver), individual coins in flips or holders with year/mint mark notes, foreign coins that appear old or unusual | 20-30% (~100-150 coins) |
| C | Modern circulated coins, penny collections, common commemoratives, wheat pennies (1909-1958) in average condition, loose coins without holders | 55-75% (~275-375 coins) |
Step 2: Professional Appraisal for Tier A (Strongly Recommended)
For estate purposes, Tier A items need professional evaluation.
| Action | Why | Expected Cost |
|---|
| Written appraisal from a numismatist | Estate tax compliance, FMV documentation | $100-300 for the collection |
| Individual authentication for potential key-date coins | Ensures accurate grading and identification | $20-50 per coin |
Visit 2-3 coin dealers. Ask for a written appraisal for estate purposes (specify you are not selling yet). A written appraisal documents the FMV and is defensible if the estate is reviewed.
Step 3: Price Guide Estimates for Tier B
| Method | How to Apply |
|---|
| Silver value | U.S. pre-1965 silver coins: calculate melt value. Weight x 90% silver x current silver spot price per troy ounce. This is the floor value. |
| Price guide | Look up individual coins by year, mint mark, and condition in an annual coin reference guide. Use the grade that matches the coin's wear level. |
| Comps | For coins that may be above common value, check completed auction listings for the specific year/mint/grade. |
Step 4: Lot Estimate for Tier C
| Item Type | Typical Value |
|---|
| Common modern coins | Face value only ($0.01-$1.00 each) |
| Wheat pennies (avg. condition) | $0.05-$0.25 each (bulk lot price) |
| Common world coins | $0.10-$0.50 each (bulk lot price) |
| Common commemoratives | Face value to $2-3 each |
Estimated Value Framework
Without seeing the specific coins, here is the typical range for a 500-coin collection accumulated over 40 years by a dedicated collector:
| Tier | Items | Est. Value Range | Notes |
|---|
| Tier A | 25-75 | $500-$10,000+ | Depends heavily on whether gold or key-date silver is present |
| Tier B | 100-150 | $200-$2,000 | Silver melt value provides a reliable floor |
| Tier C | 275-375 | $50-$200 | Mostly face value with occasional exceptions |
| Total | 500 | $750-$12,000+ | Wide range reflects uncertainty without item-specific data |
Important: These ranges are illustrative. The actual value depends entirely on the specific coins. A single rare coin could be worth more than the rest of the collection combined.
Value Context
- Value type: Fair Market Value (for estate)
- Market trend: U.S. coin market has been stable to appreciating over the past 5 years, with key-date coins and gold particularly strong
- Confidence: Low (no individual items examined yet)
- Formal appraisal needed: Yes -- for estate settlement
Recommended Actions
- Immediate: Do not clean any coins. Cleaning reduces value by 50% or more. Store in a dry location at room temperature
- Within 30 days: Complete the triage sort to identify Tier A items
- Within 60 days: Take Tier A items to 2-3 coin dealers for written appraisal quotes
- Within 90 days: Obtain formal written appraisal for estate documentation. Share with the estate attorney
- After estate settlement: Decide whether to keep, sell, or donate. If selling, auction houses typically achieve better prices than dealer purchases for valuable coins. Dealer purchases are faster but at 50-70% of retail value
