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ROLF BERG. Ljuslyktor, 2 stycken, i form av äpplen, glaserad keramik, Torshälla.

Rolf Berg · Ceramics and porcelain · Helsingborgs Auktionskammare

Open auction lot
54
research

Acquisition position

Current all in cost

332.96 SEK
Current bid or estimate300.0 SEK
Modelled discount68.3%
Liquidity score80%

Potential market value

Specialist value interval

300 to 2206 SEK
Value confidence70%
Comparable sales30

Evidence strength

36%
Identity confidence27%
Visual match0%
External references12

Market anomaly

75%
Information gap67%
Potential undervaluation68.3%

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 factory
  • missing material
  • missing mark
  • missing dimensions

Visual laboratory

Add and compare research imagery

Object record

Known facts and missing information

ArtistRolf Berg
MakerMissing
MediumMissing
MaterialsMissing
Dimensions? × ? × ? cm
WeightMissing g
YearMissing
EditionMissing
MarksMissing
ConditionSmärre ytslitage, bruksskick.
ProvenanceMissing
Modelceramics_specialist 2.0.0

Diameter ca 10, höjd 9 cm.

Identity resolution

Artist and maker hypotheses

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

12 candidates
1 independent sources

Man Ray American, 1890–1976

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

27% combined confidence
1 independent sources

Keith Haring American, 1958-1990

Visual 0% · Name 44% · Marks 25% · Material 40%

26% combined confidence
1 independent sources

Roni Horn American, born 1955

Visual 0% · Name 42% · Marks 25% · Material 40%

25% combined confidence
1 independent sources

Greek; probably Samos

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

25% combined confidence
1 independent sources

Willie Doherty Irish, born 1959

Visual 0% · Name 37% · Marks 25% · Material 40%

25% combined confidence
1 independent sources

India Rajasthan, Jaipur

Visual 0% · Name 37% · Marks 25% · Material 40%

25% combined confidence
1 independent sources

Charles Eames (American, 1907–1978) Ray Eames (American, 1912–1988) Made by Herman Miller Furniture Co. Zeeland, Michigan, founded 1905 (note: Herman Miller Furn. Co. became Herman Miller Inc. in 1960)

Visual 0% · Name 36% · Marks 25% · Material 40%

25% combined confidence
1 independent sources

Roman

Visual 0% · Name 36% · Marks 25% · Material 40%

24% combined confidence
1 independent sources

Ōmura Kōyō Japanese, 1891-1983

Visual 0% · Name 35% · Marks 25% · Material 40%

24% combined confidence
1 independent sources

Artist unknown Japanese

Visual 0% · Name 35% · Marks 25% · Material 40%

24% combined confidence
1 independent sources

Vik Muniz Brazilian, born 1961

Visual 0% · Name 34% · Marks 25% · Material 40%

24% combined confidence
1 independent sources

Noguchi Shohin Japanese, 1847-1917

Visual 0% · Name 33% · Marks 25% · Material 40%

24% 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

Pair of Protomes Depicting the Forepart of a Griffin

Greek; probably Samos

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

Chess Set

Man Ray American, 1890–1976

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

Attachments Depicting Busts of Silenoi

Roman

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

Lounge Chair and Ottoman

Charles Eames (American, 1907–1978) Ray Eames (American, 1912–1988) Made by Herman Miller Furniture Co. Zeeland, Michigan, founded 1905 (note: Herman Miller Furn. Co. became Herman Miller Inc. in 1960)

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

Double Elvis

Vik Muniz Brazilian, born 1961

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

Blue Phoenix

Ōmura Kōyō Japanese, 1891-1983

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

The Gathering at the Orchid Pavilion (front); Geese among Reeds (back)

Noguchi Shohin Japanese, 1847-1917

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

Pair of Bracelets with Confronting Makara Heads (Karas)

India Rajasthan, Jaipur

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

The Tale of Taishokan

Artist unknown Japanese

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

Strategy: Sever/Isolate

Willie Doherty Irish, born 1959

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

Untitled (Pair of Vases)

Keith Haring American, 1958-1990

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

Gold Mats, Paired—for Ross and Felix

Roni Horn American, born 1955

0% similarityCheck object rights; API metadata is open

Comparable logic

Specialist model explanation

Comparable IDMatchPriceReasons
668756%550.0 SEKidentity 74%, material 45%, size 62%, title 42%, factory marks 45%
438752%300.0 SEKidentity 62%, material 45%, size 62%, title 46%, factory marks 45%
558152%961.0 SEKidentity 62%, material 45%, size 62%, title 44%, factory marks 45%
316752%300.0 SEKidentity 62%, material 45%, size 62%, title 42%, factory marks 45%
1658752%200.0 SEKidentity 60%, material 45%, size 62%, title 43%, factory marks 45%
2236951%2206.0 SEKidentity 57%, material 45%, size 62%, title 45%, factory marks 45%
1920651%2600.0 SEKidentity 55%, material 45%, size 62%, title 56%, factory marks 45%
1174551%350.0 SEKidentity 55%, material 45%, size 62%, title 53%, factory marks 45%

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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