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JOHAN FREDRIK NORRMAN. Skänkstop, tenn, Karlskrona, 1839.

Johan Fredrik Norrman · Silver and metalware · Formstad Auktioner

Open auction lot
54
research

Acquisition position

Current all in cost

425.0 SEK
Current bid or estimate400.0 SEK
Modelled discount74.7%
Liquidity score84%

Potential market value

Specialist value interval

457 to 4322 SEK
Value confidence70%
Comparable sales30

Evidence strength

39%
Identity confidence32%
Visual match0%
External references12

Market anomaly

83%
Information gap67%
Potential undervaluation74.7%

Risk profile

8%
Authenticity risk8%
Condition risk6%

Investigation rationale

Why this may be worth considering

  • maker or artist identity supplied
  • auction estimate is materially below the specialist model
  • all in acquisition cost is at least 55 percent below modelled value
  • Estimate materially below specialist value
  • Alias or spelling mismatch

Decision guardrails

What must be verified

  • missing hallmarks
  • missing fineness
  • missing weight
  • missing date_letter

Visual laboratory

Add and compare research imagery

Object record

Known facts and missing information

ArtistJohan Fredrik Norrman
MakerMissing
MediumMissing
MaterialsMissing
Dimensions? × ? × ? cm
WeightMissing g
YearMissing
EditionMissing
MarksMissing
ConditionBruks- och åldersrelaterat slitage.
ProvenanceMissing
Modelsilver_metalware_specialist 2.0.0

Höjd 20 cm.

Identity resolution

Artist and maker hypotheses

Ranked from independent evidence. Confirmation or rejection becomes controlled training data.

4 candidates
1 independent sources

Paul Cezanne (French, 1839–1906)

Visual 0% · Name 86% · Marks 25% · Material 40%

33% combined confidence
1 independent sources

Charles Joseph Beauverie French, 1839-1923

Visual 0% · Name 86% · Marks 25% · Material 40%

33% combined confidence
1 independent sources

Nadar (Gaspard Félix Tournachon) French, 1820–1910

Visual 0% · Name 41% · Marks 25% · Material 40%

25% combined confidence
1 independent sources

Thomas Cole (American, born England, 1801–1848)

Visual 0% · Name 38% · Marks 25% · Material 40%

25% combined confidence

Closed deal feedback

Teach the valuation model

Enter the verified hammer price after the auction closes. Only verified outcomes become calibration data.

Learning guardrail

Truth before training

  • Unverified AI output is stored as a hypothesis only.
  • One-source matches are confidence capped.
  • Rejected matches improve source and feature calibration.
  • At least five verified closed sales are required per category.

Global research evidence

Reference material found elsewhere

12 references
Art Institute of Chicago

The Basket of Apples

Paul Cezanne (French, 1839–1906)

0% similarityCheck object rights; API metadata is open
Art Institute of Chicago

L'Auberge du soleil levant

Charles Joseph Beauverie French, 1839-1923

0% similarityCheck object rights; API metadata is open
Art Institute of Chicago

The Bay of Marseille, Seen from L'Estaque

Paul Cezanne (French, 1839–1906)

0% similarityCheck object rights; API metadata is open
Art Institute of Chicago

Francis Planté (French pianist, 1839-1934)

Nadar (Gaspard Félix Tournachon) French, 1820–1910

0% similarityCheck object rights; API metadata is open
Art Institute of Chicago

Auvers, Panoramic View

Paul Cezanne (French, 1839–1906)

0% similarityCheck object rights; API metadata is open
Art Institute of Chicago

Madame Cezanne in a Yellow Chair

Paul Cezanne (French, 1839–1906)

0% similarityCheck object rights; API metadata is open
Art Institute of Chicago

The Vase of Tulips

Paul Cezanne (French, 1839–1906)

0% similarityCheck object rights; API metadata is open
Art Institute of Chicago

New England Scenery

Thomas Cole (American, born England, 1801–1848)

0% similarityCheck object rights; API metadata is open
Art Institute of Chicago

The Bathers

Paul Cezanne (French, 1839–1906)

0% similarityCheck object rights; API metadata is open
Art Institute of Chicago

The Plate of Apples

Paul Cezanne (French, 1839–1906)

0% similarityCheck object rights; API metadata is open
Art Institute of Chicago

The Three Skulls

Paul Cézanne French, 1839-1906

0% similarityCheck object rights; API metadata is open
Art Institute of Chicago

Bathers

Paul Cezanne (French, 1839–1906)

0% similarityCheck object rights; API metadata is open

Comparable logic

Specialist model explanation

Comparable IDMatchPriceReasons
1577658%502.0 SEKidentity 76%, material 45%, size 62%, title 57%, hallmarks 45%, weight 62%
1654%800.0 SEKidentity 62%, material 45%, size 62%, title 45%, hallmarks 45%, weight 62%
772154%1325.0 SEKidentity 62%, material 45%, size 62%, title 44%, hallmarks 45%, weight 62%
1396153%4800.0 SEKidentity 61%, material 45%, size 62%, title 45%, hallmarks 45%, weight 62%
1318152%450.0 SEKidentity 56%, material 45%, size 62%, title 48%, hallmarks 45%, weight 62%
95152%4200.0 SEKidentity 56%, material 45%, size 62%, title 47%, hallmarks 45%, weight 62%
80552%4200.0 SEKidentity 56%, material 45%, size 62%, title 45%, hallmarks 45%, weight 62%
147151%1900.0 SEKidentity 53%, material 45%, size 62%, title 47%, hallmarks 45%, weight 62%

Automatic signature module

Every artwork image is checked for signatures and marks

The local engine detects and isolates candidate regions, searches the trusted mark library and runs conservative signature forensics. Optional AI interprets unreadable regions and creates research queries without changing the forensic verdict.

Candidate regions0
Signature regions0
AI enrichmentLocal only
PipelineNot run

No automatic mark result yet

The module runs during normal analysis when a local image is available.

Marks laboratory

Isolate and identify signatures, hallmarks and maker marks

110 independent methods generate cleanup variants, stroke and symbol descriptors, library matches, trust controls and conflict warnings.

Open mark library

Match an unknown mark

Upload the tightest available crop. Include a little surrounding surface so the system can separate paint, engraving, glare and background.

Add a known reference

Signature forensics

Check consistency with known genuine variation

This does not declare a signature genuine. It measures fit against a multi-source reference set, confusing signers and natural variation.

No forensic check yet

Run mark matching first, then compare the questioned signature against a sufficiently broad trusted reference set.

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