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MONICA BRATT. bonbonjär, glas, Reijmyre Glasbruk.

Monica Bratt · Art glass · Gomér & Andersson Norrköping

Open auction lot
37
low priority

Acquisition position

Current all in cost

500.0 SEK
Current bid or estimate350.0 SEK
Modelled discount36.5%
Liquidity score76%

Potential market value

Specialist value interval

300 to 1500 SEK
Value confidence70%
Comparable sales30

Evidence strength

36%
Identity confidence27%
Visual match0%
External references12

Market anomaly

41%
Information gap67%
Potential undervaluation36.5%

Risk profile

8%
Authenticity risk8%
Condition risk6%

Investigation rationale

Why this may be worth considering

  • maker or artist identity supplied

Decision guardrails

What must be verified

  • missing factory
  • missing signature
  • missing model
  • missing dimensions

Visual laboratory

Add and compare research imagery

Object record

Known facts and missing information

ArtistMonica Bratt
MakerMissing
MediumMissing
MaterialsMissing
Dimensions? × ? × ? cm
WeightMissing g
YearMissing
EditionMissing
MarksMissing
ConditionBruks- och åldersrelaterat slitage.
ProvenanceMissing
Modelglass_specialist 2.0.0

Rödfärgad glasmassa. Höjd ca 19 cm.

Identity resolution

Artist and maker hypotheses

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

10 candidates
1 independent sources

Donald Roberts (American, 1923-2015) printed by Donald Roberts published by Tamarind Lithography Workshop (American, founded 1960)

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

25% combined confidence
1 independent sources

Frank O. Gehry American, born Canada 1929-2025

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

25% combined confidence
1 independent sources

Ed Ruscha American, born 1937

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

25% combined confidence
1 independent sources

Joel Sternfeld American, born 1944

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

25% combined confidence
1 independent sources

Angela Kelly American, born Northern Ireland 1950

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

25% combined confidence
1 independent sources

Alfred Leslie American, 1927-2023

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

25% combined confidence
1 independent sources

Hiratsuka Un'ichi (Japanese, 1895-1997)

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

25% combined confidence
1 independent sources

Algimantas Kezys American, born Lithuania, 1928-2015

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

24% combined confidence
1 independent sources

Italian; possibly Venice

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

24% combined confidence
1 independent sources

Anders Zorn Swedish, 1860-1920

Visual 0% · Name 34% · 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

Olga Bratt

Anders Zorn Swedish, 1860-1920

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

Olga Bratt

Anders Zorn Swedish, 1860-1920

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

Portrait of Monica Collier

Alfred Leslie American, 1927-2023

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

Santa Monica, California

Algimantas Kezys American, born Lithuania, 1928-2015

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

Gyroscope - Santa Monica

Donald Roberts (American, 1923-2015) printed by Donald Roberts published by Tamarind Lithography Workshop (American, founded 1960)

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

Eucalyptus, Santa Monica, California

Hiratsuka Un'ichi (Japanese, 1895-1997)

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

Santa Monica Blvd. from Roxbury to Wilshire Blvd.

Ed Ruscha American, born 1937

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

Sitting Beaver Chair

Frank O. Gehry American, born Canada 1929-2025

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

Rustic Canyon, Santa Monica, California, from the series "American Prospects"

Joel Sternfeld American, born 1944

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

Monica

Angela Kelly American, born Northern Ireland 1950

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

A Woman Out Shopping with Her Pet Rabbit, Santa Monica, California, from the series "Stranger Passing"

Joel Sternfeld American, born 1944

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

Panels from the Altarpiece of The Assumption of the Virgin with Saints: Saint Monica

Italian; possibly Venice

0% similarityCheck object rights; API metadata is open

Comparable logic

Specialist model explanation

Comparable IDMatchPriceReasons
862368%700.0 SEKidentity 100%, material 45%, size 62%, title 93%, factory marks 45%
353065%850.0 SEKidentity 100%, material 45%, size 62%, title 47%, factory marks 45%
948956%654.0 SEKidentity 71%, material 45%, size 62%, title 52%, factory marks 45%
498356%1803.0 SEKidentity 71%, material 45%, size 62%, title 52%, factory marks 45%
1089956%300.0 SEKidentity 71%, material 45%, size 62%, title 48%, factory marks 45%
1316756%350.0 SEKidentity 71%, material 45%, size 62%, title 47%, factory marks 45%
718256%1500.0 SEKidentity 71%, material 45%, size 62%, title 49%, factory marks 45%
761656%200.0 SEKidentity 71%, material 45%, size 62%, title 48%, 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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