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HARRY BERTOIA. Fåtölj, "Diamond chair".

Harry Bertoia · Furniture and design · Uppsala Auktionskammare

Open auction lot
18
low priority

Acquisition position

Current all in cost

2000.0 SEK
Current bid or estimate2000.0 SEK
Modelled discount0.0%
Liquidity score86%

Potential market value

Specialist value interval

300 to 6555 SEK
Value confidence69%
Comparable sales30

Evidence strength

40%
Identity confidence37%
Visual match0%
External references2

Market anomaly

0%
Information gap67%
Potential undervaluation0.0%

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: later licensed production
  • missing manufacturer
  • missing model
  • missing materials
  • missing dimensions

Visual laboratory

Add and compare research imagery

Object record

Known facts and missing information

ArtistHarry Bertoia
MakerMissing
MediumMissing
MaterialsMissing
Dimensions? × ? × ? cm
WeightMissing g
YearMissing
EditionMissing
MarksMissing
ConditionBruks- och åldersrelaterat slitage. Färgbortfall. Rostangrepp.
ProvenanceMissing
Modelfurniture_design_specialist 2.0.0

Lackerad emtall, sitthöjd ca 40 cm. L 84, B 65, H 76 cm.

Identity resolution

Artist and maker hypotheses

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

2 candidates
1 independent sources

Harry Bertoia

Visual 0% · Name 100% · Marks 25% · Material 40%

35% combined confidence
1 independent sources

Designed by Harry Bertoia American, born Italy, 1915–1978 Made by Knoll International, Inc. East Greenfield, Pennsylvania, founded 1938

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

26% 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

2 references

Comparable logic

Specialist model explanation

Comparable IDMatchPriceReasons
10150%10573.0 SEKidentity 56%, material 45%, size 62%, title 36%, manufacturer labels 45%
677250%6555.0 SEKidentity 55%, material 45%, size 62%, title 34%, manufacturer labels 45%
189549%13000.0 SEKidentity 55%, material 45%, size 62%, title 27%, manufacturer labels 45%
105849%6000.0 SEKidentity 55%, material 45%, size 62%, title 23%, manufacturer labels 45%
529249%1000.0 SEKidentity 46%, material 45%, size 62%, title 58%, manufacturer labels 45%
267848%701.0 SEKidentity 45%, material 45%, size 62%, title 54%, manufacturer labels 45%
55148%13000.0 SEKidentity 45%, material 45%, size 62%, title 52%, manufacturer labels 45%
264248%300.0 SEKidentity 45%, material 45%, size 62%, title 52%, manufacturer labels 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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