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JOHAN PETTERSON BERG. BÄGARE. Silver med förgylld insida, Norrköping, 1762.

Johan Petterson Berg · Silver and metalware · Örebro Stadsauktioner

Open auction lot
36
low priority

Acquisition position

Current all in cost

1200.0 SEK
Current bid or estimate850.0 SEK
Modelled discount35.6%
Liquidity score84%

Potential market value

Specialist value interval

800 to 4200 SEK
Value confidence71%
Comparable sales30

Evidence strength

40%
Identity confidence36%
Visual match0%
External references12

Market anomaly

29%
Information gap67%
Potential undervaluation35.6%

Risk profile

13%
Authenticity risk13%
Condition risk6%

Investigation rationale

Why this may be worth considering

  • maker or artist identity supplied

Decision guardrails

What must be verified

  • category trap check: silver plate
  • missing hallmarks
  • missing fineness
  • missing weight
  • missing date_letter

Visual laboratory

Add and compare research imagery

Object record

Known facts and missing information

ArtistJohan Petterson Berg
MakerMissing
MediumMissing
MaterialsMissing
Dimensions? × ? × ? cm
WeightMissing g
YearMissing
EditionMissing
MarksMissing
ConditionOputsad, fläckar.
ProvenanceMissing
Modelsilver_metalware_specialist 2.0.0

Vikt 60 g. Höjd 8 cm, diameter 7 cm.

Identity resolution

Artist and maker hypotheses

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

7 candidates
1 independent sources

Katsukawa Shun’ei Japanese, 1762–1819

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

33% combined confidence
1 independent sources

Jean Baptiste Joseph Wicar (French, 1762–1834)

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

33% combined confidence
1 independent sources

Christoph-Wilhelm Bock (German, born 1754/55) after Ambrosius Gabler (German, 1762-1834)

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

33% combined confidence
1 independent sources

Jean Moyreau (French, 1690-1762) after Jean Antoine Watteau (French, 1684-1721)

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

33% combined confidence
1 independent sources

Hubert Robert French, 1733-1808

Visual 0% · Name 48% · Marks 25% · Material 40%

27% combined confidence
1 independent sources

Marked by Joseph Moser (born Bohemia [now Czech Republic], active Austria, 1715–1801) Vienna

Visual 0% · Name 39% · Marks 25% · Material 40%

25% combined confidence
1 independent sources

Giovanni Battista Cipriani Italian, 1727-1785

Visual 0% · Name 37% · 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

Shoki the Demon Queller

Katsukawa Shun'ei Japanese, 1762-1819

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

Virgil Reading the "Aeneid" to Augustus, Octavia, and Livia

Jean Baptiste Joseph Wicar (French, 1762–1834)

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

Two Sketches: Nude Child, Woman Reaching Toward Man with Lamb

Giovanni Battista Cipriani Italian, 1727-1785

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

The Actor Iwai Hanshiro IV as Tonase (?) in the Play Kanadehon Chushingura (?), Performed at the Kiri Theater (?) in the Eighth Month, 1787 (?)

Katsukawa Shun'ei Japanese, 1762-1819

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

Actor Segawa Kikunojô III Possibly as Ono no Komachi in “Komachi Village: New Year at the Theater” (“Komachimura shibai no shôgatsu”)

Katsukawa Shun’ei Japanese, 1762–1819

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

Actor Iwai Hanshirô IV as Akita Jônosuke Yoshikage in a “Shibaraku” role in “Memorial Service for St. Nichiren: A Model of ‘The Potted Trees’”(“Mieiko Nori no Hachi no Ki”)

Attributed to Katsukawa Shun’ei Japanese, 1762–1819

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

A Physionotrace Portraitist

Christoph-Wilhelm Bock (German, born 1754/55) after Ambrosius Gabler (German, 1762-1834)

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

Temple of Vespasian

Hubert Robert French, 1733-1808

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

The Actor Ichikawa Komazo II as Ono Sadakuro in the Play Chuko Ryogoku Ori, Performed at the Nakamura Theater in the Seventh Month, 1790

Katsukawa Shun'ei Japanese, 1762-1819

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

Feste Bacchique, plate 97 from " L'Oeuvre d'Antoine Watteau"

Jean Moyreau (French, 1690-1762) after Jean Antoine Watteau (French, 1684-1721)

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

The Sumo Wrestler Kurogumo Otozô with the Teahouse Waitress Naniwa Okita

Katsukawa Shun’ei Japanese, 1762–1819

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

Monstrance

Marked by Joseph Moser (born Bohemia [now Czech Republic], active Austria, 1715–1801) Vienna

0% similarityCheck object rights; API metadata is open

Comparable logic

Specialist model explanation

Comparable IDMatchPriceReasons
1998466%1500.0 SEKidentity 98%, material 45%, size 62%, title 81%, hallmarks 45%, weight 62%
80557%4200.0 SEKidentity 71%, material 45%, size 62%, title 54%, hallmarks 45%, weight 62%
772154%1325.0 SEKidentity 62%, material 45%, size 62%, title 54%, hallmarks 45%, weight 62%
1654%800.0 SEKidentity 62%, material 45%, size 62%, title 44%, hallmarks 45%, weight 62%
2046452%300.0 SEKidentity 57%, material 45%, size 62%, title 45%, hallmarks 45%, weight 62%
2208252%670.0 SEKidentity 57%, material 45%, size 62%, title 40%, hallmarks 45%, weight 62%
95152%4200.0 SEKidentity 56%, material 45%, size 62%, title 50%, hallmarks 45%, weight 62%
308152%650.0 SEKidentity 56%, material 45%, size 62%, title 41%, 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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