Object codes and appraisal value basics
Object codes, inventory numbers, labels, hallmarks, foundry stamps, and signatures are appraisal clues. They can help connect an item to maker, market, provenance, or prior sale history, but they do not establish value on their own.
Use this guide when a painting, print, sculpture, decorative object, or antique carries a code or mark that may matter. The right question is not only what the mark says, but whether the object supports the story implied by the mark.
Free first read
Check whether a code or mark affects value
Upload the full object, close-ups of codes and labels, condition details, provenance documents, and the decision you need to make. The free screener can flag the next evidence gap.
Start with a free screener. Use a signed report when you need insurance, estate, donation, resale, or formal documentation.
How We Research Valuation Data
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1. Identify what kind of code or mark it is
- Inventory or accession numbers: may connect to museum, dealer, gallery, auction, or estate records.
- Maker marks and signatures: may support attribution if placement, materials, style, and wear are consistent.
- Foundry, edition, or publisher marks: may affect market tier for sculpture, prints, and design objects.
- Repair or conservation marks: can explain condition history and prior treatment.
Object code value evidence table
This is not a price-comp table. Use it to decide whether a code or mark changes the appraisal conclusion.
| Photo | Evidence | Date | Record | Value impact | What to verify | Source |
|---|---|---|---|---|---|---|
| Code | Inventory or accession code | Inspection date | Object record | May connect to provenance, prior sale, exhibition, or collection data. | Exact transcription, location, label material, typography, adhesive, and matching records. | Object photos / archive records |
| Mark | Signature, hallmark, or stamp | Inspection date | Mark file | Can support maker, date, origin, or attribution level. | Placement, strike, wear, medium, known exemplars, and consistency with object materials. | Reference files / appraiser notes |
| Condition | Condition and restoration | Inspection date | Condition report | Can outweigh a mark when damage or later alteration is significant. | Retouching, replacement, repairs, structural issues, surface loss, and inspection limits. | Detail photos / conservation notes |
| Docs | Provenance support | Record dates | Ownership chain | Can turn a code from a clue into usable evidence. | Invoices, labels, dealer records, catalog entries, exhibition history, and gaps. | Owner/archive records |
| Market | Marked comparable sales | Sale dates | Comp set | Shows whether similar marks affect price in the relevant market. | Same maker, mark type, attribution level, medium, size, condition, venue, and date. | Auction/dealer records |
| Report | Value definition | Effective date | Assignment scope | Determines how the evidence is reconciled. | Fair market, replacement, liquidation, insurance, estate, donation, intended users. | Report/workfile |
Takeaway: codes and marks matter most when they unlock evidence that changes attribution, provenance, condition risk, or the comparable set.
Have a code or mark to check?
Upload it with the whole object, not just a close-up.
The free screener can flag whether the mark is meaningful for value, whether more documentation is needed, or whether a signed report is the better path.
Use the free screener2. Connect the code to provenance
An inventory code can be powerful when it matches a dealer ledger, auction sticker, exhibition checklist, insurance schedule, or estate inventory. Without that match, it should be treated as a clue rather than proof.
3. Test attribution against materials and condition
A code that names a maker is not enough. Compare the object’s materials, construction, surface, wear, restoration, labels, and style against the claimed date and origin before changing the attribution level.
4. Compare marked examples in the right market
For value, find sales where the same kind of mark appears on genuinely comparable objects. Record whether prices include buyer premium, whether the attribution was accepted, and whether condition or provenance explain the result.
Search variations people ask
Collectors often search these object-code questions:
- object codes marks appraisal value
- auction inventory number antique value
- gallery label appraisal provenance
- foundry stamp sculpture value
- artist signature inventory code appraisal
- dealer stock number art provenance
- how marks affect art appraisal value
- compare marked antiques auction sales
Each question maps to the evidence workflow above.
References
Wrap-up
Object codes and marks can shift appraisal value when they connect to reliable records or change attribution confidence. Document the mark, verify the context, and let the evidence determine how much weight it deserves.
