Autographs 101 · Collector guide
How to research what an autograph may be worth
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Free autograph comparable-sales worksheet
Keep a record of what you compared and why. This blank CSV separates the sold evidence from asking prices and records exclusions. It does not fetch prices, calculate a valuation or recommend a purchase.
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candidate_reference,signer_claimed,item_type,card_year_set_number,parallel_or_variation,size,inscription,condition_notes,authentication_claim,sale_status,sale_date,reported_amount,currency,buyer_premium_basis,shipping_basis,accepted_price_known,evidence_decision,reason_for_decision,research_date
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Illustrative comparison: three listings, not three prices to average
Your piece is a signed 8-by-10 photo. Candidate A is a documented sale of a similar photo but has a personalization: investigate the difference. Candidate B is a signed rookie card: exclude it as a direct photo comparison. Candidate C is an active asking price with no known sale: keep it outside your sold-evidence set.
Only A is a candidate for closer comparison, and even that match needs context. Do not manufacture a numerical estimate from an unsuitable group of listings.
Illustrative comparison: the accepted offer is unknown
A listing indicates that an offer was accepted, but the displayed number is not confirmed as the amount paid. Record the final accepted price as unknown until a reliable source supplies it. Separately note the currency and whether any buyer's premium or shipping was included.
Do not copy the asking amount into the sold-price column. Keep the record as incomplete evidence rather than converting uncertainty to zero or a precise value.
What makes a sale comparable?
The same signer is only the starting point. A signed trading card, photograph and game-used jersey are different objects. Match the item type and relevant details before treating a sale as evidence for your piece.
Check signature visibility, item condition, inscriptions and supporting documentation. If there are too few close matches, state that limitation rather than presenting a precise figure.
How should you record sale evidence?
Save the listing or auction reference, sale date, item description, reported price and currency. Note whether the result includes a buyer's premium or whether fees and shipping are additional. A listing marked completed is not necessarily a sale.
Keep asking prices separate from completed-sale evidence. If the final accepted price is not visible, mark it as unknown rather than assuming the displayed amount was paid. Compare several relevant records when available and explain which you excluded.
A practical comparison checklist
For a signed photo, start with other photos of the same signer and similar size. Check whether inscriptions, signature placement, condition and authentication status differ. Record those differences alongside each sale rather than averaging unlike items.
If the estimate matters for an insurance, estate or other formal purpose, ask the receiving organization what documentation and qualifications it requires. This research guide is not a formal appraisal or a promise of future value.
Where can I research sold prices rather than asking prices?
Use a source that identifies completed sales and explains the amount reported. eBay describes Product Research as a source of real-world sales data with keyword and condition filters, available through Seller Hub. Access, date coverage and available fields should be checked at the provider; this worksheet is not connected to an external pricing database.
Retain the exact listing or auction reference so you can revisit the evidence. A screenshot without a date or source is difficult to evaluate later. Price-guide values, active listings, automated estimates and actual sales are different forms of information; label them instead of mixing them.
Can I compare a signed card with an unsigned card?
Not as a direct like-for-like sale without explaining the difference. Start with the exact year, set, card number and variation, then compare signature circumstances, inscriptions, condition and authentication claims. A price for an unsigned copy does not establish the additional value of an autograph.
Similarly, a numerically graded card and a raw card can represent materially different offerings. Record what differs. When comparable evidence is too sparse, the honest output is limited evidence—not an automatic premium or a confidently rounded value.
How should I use the comparison worksheet?
Enter one candidate per row. Mark its sale status, preserve the reference and date, and describe the differences from your piece. Use the decision and reason fields to identify a candidate for further review, an exclusion, or incomplete evidence. The blank file has no formulas and does not average prices that may not belong together.
Before describing an estimate, review whether your included candidates really match, whether the amounts are known, and whether the time period is relevant. Keep your purchase cost separate. A more organized research record improves your ability to explain a conclusion; it does not remove market uncertainty.