Research Case
Dr. Josef von Zahn
AI-Driven Digital Archaeology: Bringing 19th Century Archives Home
Official Acceptance Certificate
On 6 March 2026, the Steiermärkisches Landesarchiv (Styrian State Archives, Graz, Austria) issued an official letter confirming formal accession of the 1878 Correspondenzkarte into its permanent collection.
Click the certificate to view full document.
Archive Portrait — A connection across time
Case Overview
- Subject:
- 1878 Correspondenzkarte by Dr. Josef von Zahn, founding director of the Steiermärkisches Landesarchiv, Austria
- Discovered:
- eBay UK — anonymous old postcard, EUR 5.00
- Accessioned Into:
- Steiermärkisches Landesarchiv, Graz, Austria
- Significance:
- AI-enabled cross-border identification of a founding director's manuscript, filling a gap in the archive's own collection
Authentication Process
Dynamic crawling monitors global auction platforms in real time. Retrieval window locked to 1869-1900 — high historical value, insufficiently indexed. Year-by-year sweeps prevent keyword-bias omissions; AI locks in value before sellers recognise the document's significance.
Three-step process: (1) Kurrentschrift OCR — deep-learning model parses 19th-century German cursive to extract the signature; (2) Relational Analysis — 'Dr. Josef von Zahn' matched against European historical databases as founding director of the Styrian State Archives; (3) Postmark Verification — Graz 1878 confirms alignment with his known activities.
The card bears the autograph of the archive's founding director, carrying immense symbolic value. When verifying on the archive's website, AI image recognition identified the homepage portrait as Dr. von Zahn himself — triggering the donation mechanism.
Historical Context
Sender: Dr. Josef von Zahn
Austrian historian and archivist; founding director of the Steiermärkisches Landesarchiv and professor at the University of Graz. Renowned for research into Austrian medieval history. Signed D. v. Zahn, sent from Graz.
Recipient: Justus Perthes Verlag, Gotha
Germany's foremost geographical publisher, producing Stieler's Handatlas and Petermanns Geographische Mitteilungen — the global centre of geographical research in its era.
Letter — 29 May 1878
"...I am still lacking a map of the Alpine region at a scale of 1:100,000 or 1:200,000. Should you be able to send me such a sheet for reference, I would be most grateful. As for the spelling of place names, I have cross-checked them against the latest historical documents..."
— Dr. Josef von Zahn, Graz
Justus Perthes replied on 2 June 1878: cartographic works in the form requested were not held in stock.
Research Case · China
Yadong Library Editorial Office
27 Wenzhou Road, Shanghai — From Demolition Threat to Immovable Cultural Heritage
现代快报 Front Page · 2024.4.28
Feature Report (A4) · 关注版
In 2021, Shanghai collector and cultural historian Chen Junjie (陈思航) acquired a collection of letters addressed to the Yadong Library (亚东图书馆) editorial office. Cross-referencing these letters with the memoir of editor Wang Yuanfang (汪原放), he identified 27 Wenzhou Road as the sole surviving Yadong Library site in Shanghai — a building slated for demolition under urban renewal plans.
On 4 February 2023, Chen Junjie conducted an on-site verification with Wang Naigan's great-granddaughter, confirming the site through its brick-carved gate inscription "安且吉兮", architectural layout, and postmarked letter envelopes. His subsequent public advocacy led to a front-page feature in Modern Express (现代快报) on 28 April 2024, triggering national media attention.
Five years after his initial discovery, on 10 February 2026, the Huangpu District Government officially listed the site as an immovable cultural heritage point under China's 4th National Cultural Relics Survey — saving it from demolition.