Acquisition position
Current all in cost
500.0 SEK
Current bid or estimate350.0 SEK
Modelled discount39.9%
Liquidity score76%
Ulrica Hydman-Vallien · Art glass · Karlstad Hammarö Auktionsverk
Acquisition position
Potential market value
Evidence strength
Market anomaly
Risk profile
Investigation rationale
Decision guardrails
Visual laboratory
Object record
Höjd 10 cm.
Identity resolution
Ranked from independent evidence. Confirmation or rejection becomes controlled training data.
Visual 0% · Name 86% · Marks 25% · Material 40%
33% combined confidenceVisual 0% · Name 39% · Marks 25% · Material 40%
25% combined confidenceVisual 0% · Name 38% · Marks 25% · Material 40%
25% combined confidenceVisual 0% · Name 38% · Marks 25% · Material 40%
25% combined confidenceVisual 0% · Name 38% · Marks 25% · Material 40%
25% combined confidenceVisual 0% · Name 37% · Marks 25% · Material 40%
25% combined confidenceVisual 0% · Name 37% · Marks 25% · Material 40%
25% combined confidenceVisual 0% · Name 36% · Marks 25% · Material 40%
24% combined confidenceVisual 0% · Name 36% · Marks 25% · Material 40%
24% combined confidenceVisual 0% · Name 35% · Marks 25% · Material 40%
24% combined confidenceVisual 0% · Name 32% · Marks 25% · Material 40%
24% combined confidenceClosed deal feedback
Enter the verified hammer price after the auction closes. Only verified outcomes become calibration data.
Learning guardrail
Global research evidence
Vito Acconci American, 1940-2017
0% similarityCheck object rights; API metadata is openArt Institute of ChicagoJohn Baldessari American, 1931–2020
0% similarityCheck object rights; API metadata is openArt Institute of ChicagoDenuelle Porcelain Manufactory (1818–29) Paris
0% similarityCheck object rights; API metadata is openArt Institute of ChicagoBruce Alonzo Goff American, 1904-1982
0% similarityCheck object rights; API metadata is openArt Institute of ChicagoJo Baer American, 1929-2025
0% similarityCheck object rights; API metadata is openArt Institute of ChicagoEdward Dupaquier Dart American, 1922–1975
0% similarityCheck object rights; API metadata is openArt Institute of ChicagoBurnham and Root (American, 1873–1892) Daniel Hudson Burnham (American, 1846–1912) John Wellborn Root (American, 1850–1891) E.C. Shankland (American, early 20th Cent.)
0% similarityCheck object rights; API metadata is openArt Institute of ChicagoGünter Förg German, 1952–2013
0% similarityCheck object rights; API metadata is openArt Institute of ChicagoDesigned by Narcissa Niblack Thorne American, 1882-1966
0% similarityCheck object rights; API metadata is openArt Institute of ChicagoGiovanni Battista Piranesi (Italian, 1720-1778) published by Francesco (Italian, 1758-1810) and Pietro Piranesi (Italian, born 1758/9)
0% similarityCheck object rights; API metadata is openArt Institute of ChicagoGiovanni Battista Piranesi (Italian, 1720-1778) published by Francesco (Italian, 1758-1810) and Pietro Piranesi (Italian, born 1758/9)
0% similarityCheck object rights; API metadata is openArt Institute of ChicagoJasper Johns (American, born 1930) printed by Zigmunds Priede and Donn Steward published by Universal Limited Art Editions (American, founded 1955)
0% similarityCheck object rights; API metadata is openComparable logic
| Comparable ID | Match | Price | Reasons |
|---|---|---|---|
| 18221 | 68% | 700.0 SEK | identity 100%, material 45%, size 62%, title 88%, factory marks 45% |
| 17463 | 68% | 400.0 SEK | identity 100%, material 45%, size 62%, title 82%, factory marks 45% |
| 20037 | 68% | 4200.0 SEK | identity 100%, material 45%, size 62%, title 81%, factory marks 45% |
| 16731 | 68% | 600.0 SEK | identity 100%, material 45%, size 62%, title 81%, factory marks 45% |
| 17849 | 68% | 500.0 SEK | identity 100%, material 45%, size 62%, title 81%, factory marks 45% |
| 17113 | 68% | 500.0 SEK | identity 100%, material 45%, size 62%, title 81%, factory marks 45% |
| 14426 | 68% | 350.0 SEK | identity 100%, material 45%, size 62%, title 81%, factory marks 45% |
| 13279 | 68% | 650.0 SEK | identity 100%, material 45%, size 62%, title 81%, factory marks 45% |
Automatic signature module
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.
The module runs during normal analysis when a local image is available.
Marks laboratory
110 independent methods generate cleanup variants, stroke and symbol descriptors, library matches, trust controls and conflict warnings.
Signature forensics
This does not declare a signature genuine. It measures fit against a multi-source reference set, confusing signers and natural variation.
Run mark matching first, then compare the questioned signature against a sufficiently broad trusted reference set.