Knoedler's ledgers: mapping missing entry dates and seller names

 

data source: Getty Provenance Index GitHub Knoedler file  13 Dec 2017

(analysis performed  on CSV file before GPI remodel)

Note:  Transactions prior to 1925 or in the Stockbooks 1-7 have been removed from this file, reducing the number of transactions from 40,250 to 13,809.  This enables us to focus on the years 1928 to 1970.

Three huge spikes in activity pop out: 1951, 1928 and 1942. But before we examine what happened in those years to create such a spike, we must deal with a problem of missing data.

Of the above transactions, 1,746 lack an entry date year. That's over 10%! More than even our highest peak!

What to do? Data scientists often "clean" datasets by eliminating rows with incomplete data. That is exactly what we will NOT do. Instead of eliminating these rows of incomplete data from our data set, we will focus on them. 

Why are these 1,746 transactions missing the entry date year? Do they have anything else in common?

What other indicators might supply us with the missing information? Proxies, in short, for the entry date year. (Names associated with specific date ranges, for example).

The Stock Book Numbers 1928-1970

The Stock Book Numbers for transactions with no Entry Date Year

We see that most of the missing years are from Stock Book 11.  

What else can we learn about the profile of the missing dates? We can compare the most frequent nationalities of all transactions 1928-1970 

to the nationalities of the transactions missing entry date years:

The largest contingent are American.  We don't understand this but will file it away, hoping that it might Make sense later.

What about the sellers? And here we are in for a bit of a surprise.

Of the 1,746 transactions that have no entry year, the vast majority - 1,481 - also have no seller.

What kind of ledgers are these that Knoedler was keeping, with neither year nor seller? 

Which ledgers are most concerned by this double absence?

With 1,469 mysterious transactions, it's Stock Book 11. 

Who are the joint owners listed in Book 11 ledger entrees which have no entry date or seller name?

(filter: Joint owner appear at least twice)

Joint Own Auth 1	Count	Knoedler Numbers in Book 11
Pinakos, Inc. (Rudolf Heinemann)	84	A6420, A5321, A4774, A6680, A5326, A5434, A1825, A1834, A1845, A1849, A1943, A1944, A1945, A1946, A2523, A2730, A2770, A2774, A2795, A2964, A3026, A3029, A3044, A3049, A3274, A3292, A3300, A3312, A3527, A5250, A5286, A5467, A5469, A5515, A5624, A5708, A5730, A4542, A4824, A4839, A4840, A4843, A4844, A4849, A4851, A4854, A4898, A4920, A4937, A4940, A4955, A5117, A5213, A5944, A5948, A5960, A5963, A5964, A5965, A5982, A6010, A6122, A6777, A6679, A6593, A6548, A6530, A6501, A6500, A6430, A6415, A6318, A6310, A6299, A6295, A6294, A7059, A6998, A6970, A6932, A7109, A5602, A5603, A6826
Hirschl & Adler Galleries	37	A3815, A4107, A3884, A3886, A3873, A3875, A3876, A3880, A3882, A3883, A3885, A3888, A5284, A5319, A5560, A5561, A5737, A5738, A5788, A5806, A5807, A5928, A6102, A6738, A6727, A6726, A6722, A6721, A6704, A6651, A7047, A7046, A7021, A7005, A7004, A6972, A7125
Spark, Victor David	25	A6144, A3188, A5745, A4448, A4923A, A4923C, A4923D, A4923H, A4923I, A4923K, A4923L, A4923M, A4923O, A4923P, A4923Q, A4923R, A4923S, A4923T, A4923W, A5016, A6013, A6018, A6138, A6145, A6147
Berggruen (Heinz), Galerie & Cie	23	A5750, A6640, A7031, A7030, A7029, A6899, A7119, A7120, A6070, A6073, A6114, A6112, A6150, A7018, A7017, A7016, A7015, A6844, A6843, A6443, A6350, A6347, A6641
Schempp, (Theodore), & Co.	13	A6934, A5188, A6684, A7066, A7002, A7001, A7000, A6942, A6939, A6935, A7116, A7130, A7131
Kennedy Galleries, Inc.	13	A4936, A7127, A7128, A7129, A5581, A6272, A6273, A6274, A7124, A7135, A5074, A5075, A6669
Fine Arts Associates	11	A5304, A5209, A6764, A6739, A7039, A6869, A7114, A7115, A7133, A7134, A6922
The A.B. Closson Jr. Co.	9	A5079, A5080, A5082, A5083, A5085, A5086, A5087, A5088, A5089
Betty McLean Gallery	9	A5288, A5290, A5291, A5292, A5294, A5299, A4684, A4685, A5055
E. and A. Milch	7	A3655, A3855, A3857, A3858, A4635, A6824, A7136
Marlborough-Gerson Gallery	7	A7078, A7080, A7082, A7081, A7083, A7077, A7079
Pearlman, Henry	6	A7086, A7087, A7089, A7090, A7091, A7088
Kleemann Galleries	6	A4617, A6432, A6391, A6390, A6332, A6331
De Hauke & Co.	5	A6763, A7100, A7101, A7103, A7110
Frank Perls Gallery	5	A6506, A6230, A6762, A6743, A6435
Balay, Roland	5	A3834, A3835, A3836, A3837, A3838
Latendorf Bookshop	5	A6249, A6250, A6251, A6252, A6253
Agnew's	5	A5435, A6098, A6099, A6228, A7056
Old Print Shop, The	4	A5714, A5716, A5718, A4672E
Weitzner, Julius H.	4	A6921, A5703, A6534, A6929
Charell, Ludwig	3	A6379, A6378, A6377
Babcock Galleries	3	A3413, A3661, A5072
Galerie les Tourettes (Otto Wertheimer)	2	A5281, A7117
John F. Fleming Rare Book Co.	2	A6388, A6387
Galerie des Arts Anciens et Modernes	2	A6135, A6313
SUTTON, HILDA	2	A3383, A3395
Louis Leon and Co.	2	A6801, A6525
Michelotti, M.	2	A5320, A4049
Ward Eggleston Galleries	2	A5991, A5992
Kernochan, Katherine Lorillard	2	A2144, A2145
Ackermann, (Arthur), and Son	2	A3600, A2556
Frederick A. Stern Inc.	2	A3068, A3206
Weil, (André), Galerie	2	A6701, A6795
STRÖLIN, ALFRED	2	A6478, A6477
Abdy, Robert Henry Edward, Sir, 5th Bart.	2	A7009, A6967
Colnaghi's	2	A1982, A3060

Where else do these Knoedler numbers appear? What do they tell us?

Can the recent publication of the new Getty Provenance Index on linked data principles help us to go further in the analysis of the information that is missing from the original Knoedler ledgers? How might we do this?

tbc...

DATASET: Names in new Getty Provenance Index

 In searching the new Getty Provenance Index, it can be useful to know the "preferred name" as recorded in ULAN, especially when performing a facetted search in the Knoedler files.

Below is a Dataset of names that may be helpful.  The data was retrieved on May 24, 2025. 

The uploaded CSV file contains 61,418 rows and 7 columns. It contains entities (mostly people or organizations) associated with the Getty Provenance Index, particularly those classified as E21_Person or E74_Group in the CIDOC CRM ontology.

Column Name	Description	Non-null Count
URI Linkedart json	The Linked.Art JSON URI for the entity	61,418
name	Preferred name of the person or organization	61,418
ulan	Getty ULAN (Union List of Artist Names) identifier	26,648
starId	Internal Getty Provenance Index identifier (STAR system)	28,500
birthYear	Birth year (if known, usually for people)	15,221
biography	Biographical note or description	10,521

Download Dataset (CSV)

(8.3 MB)

Frederick Mont in RKD records

Frederick Mont, AKA Fritz Mondschein or Galerie Sanct Lucas, is a name that has popped up in Nazi looted art and in forgeries, and, for this reason, a name of interest for provenance researchers and art crime specialists.

Below are artworks in the RKD data that mention "Mont, Frederick" retrieved by a Sparql query at: 

https://rkd.triply.cc/rkd/RKD-Knowledge-Graph/sparql

To see the full provenance click on the RKD link.

(Art Historians: Note the number of Art Looting Investigation Unit Red Flag Names that appear in the full provenances)

See also:Art Dealers in Provenance: Frederick Mont at the Toledo Museum of Art and LACMA 

and Frederick Mont or Mondschein in Provenances of the Getty Provenance Index Public Collections Database 

and Fritz Mont, Frederick Mondschein and Galerie Sanct Lucas

Frederick Mont in RDK database provenances

How to create a false provenance for a forgery, IKEA-style satirical instruction manual from ChatGPT

Here's a satirical IKEA-style instruction guide for assembling a false provenance for a forged artwork. It’s entirely fictional and intended to educate through humor—exposing how shady art dealings might look if they came with assembly instructions. (author: ChatGPT4o)

---

🖼️ FAKEVÄRDE

False Provenance Kit – Discreetly elevate your garage painting to gallery prestige!

📦 Contents:

• 1x Faded Auction Catalogue (pre-yellowed)

• 3x Invented Collectors (with vaguely European surnames)

• 1x Retired Art Historian (missing credentials)

• 2x “Private Collection, Switzerland” Labels

• 1x Forged Gallery Sticker

• 1x Typewriter (w/ misaligned keys for “authenticity”)

• 1x Bottle of Coffee (for artificial aging)

Chagall Search Requests for Nazi-looted art

The Picasso Museum currently is showing 'L'Art Dégéneré', an exhibition about art seized from German museums by the Nazi government which sought to ban so-called "degenerate" art and persecute artists it didn't like.

As so often with "degenerate art" the focus is on paintings lost by German museums to the predations of their own government. 

However, many of the dealers and collectors of the artists in question were German Jews, and for this reason they were targeted for persecution and plunder very early in the Nazi regime, when life was still pretty normal outside of Germany. Their assets were plundered and they were eventually murdered if they did not manage to escape. Later, after Nazi Germany attacked Poland in 1939 and France, Belgium and the Netherlands in 1940, the ERR and other Nazilooting organisations seized artworks from Jews in these countries, before murdering them. 

This post looks at some of the Jewish collectors of artworks by Marc Chagall who were plundered by the Nazis. The transfer of artworks by so-called "degenerate" artist Marc Chagall to museums and collectors around the world (and notably in the USA) cannot be told without the stories of these looted Jewish collectors.

More Names of Concern: art galleries, museums and auction houses

 In addition to art dealers and collector, several commercial art galleries, auction houses and museums are registered as Art Looting Red Flag Names or have links to Holocaust art restitution cases. This list should be added to the human "Names of Concern" when verifying art provenance texts.

Museum Collections and Names of Concern in Provenance

The following names are linked to Holocaust art and restitution cases stemming from the persecution of Jews in the Nazi era. Their presence in a provenance is a Flag that requires serious verification. (For art galleries, see "More Names of Concern".

Wikidata Queries and AI LLMs: better dataviz with ChatGPT4O

Paintings owned by family and business connections to Presidents of the Swiss Art Dealers Association

The above graph, generated by a Wikidata query, can be made easier to understand with help from AI.

Steps:

1. Run Wikidata query: 

Short link to Wikidata Query: 

https://w.wiki/Cdse

2. Download  CSV from Wikidata Query 

3.  Upload into ChatGPT4o with the following prompt:

"please graph - pay attention to edges"

Here is a graph representing the relationships between Swiss Art Dealer Association Presidents, their business or family connections, and associated paintings. The edges are labeled to indicate the type of connection, and node colors differentiate between SwissArtpres (blue), connections (green), and paintings (orange). Let me know if you'd like further adjustments

chatGPT40 : "Here is the updated graph with adjusted label positions to minimize overlap. Labels are placed with a background for clarity, and the spacing between nodes has been increased to make the connections easier to read. Let me know if you need further refinements! "​

Erroneous provenance graph with links to source documents