Heinemann and Mondschein (Frederick Mont) in provenances of artworks in American museums

The El Greco looted in 1944 by the Nazi Gestapo from Julius Priester passed through Rudolf J. Heinemann, (1901 – February 7, 1975) and the business he owned, Pinakos, and Frederick Mont (aka Fritz Mondschein) and the gallery he owned, Galerie Sanct Lukas, before being identified. The provenance of the looted artwork was falsified, and it took more than seventy years to find it, claim it and obtain restitution (in 2015). 

The obvious question for museums to ask themselves is: which artworks in our collections passed through these individuals or their businesses and are there any provenance gaps or discrepancies that require further verification. 

 The number of questions marks "?" (49) and "probably" (41) and "possibly" (30) and "might have" or "may have" (12) suggests the presence of guesswork and speculation.

Below are a few of the artworks known to have passed through Heinemann or Mont. 

Zinckgraf (or Zinkgraf) as a Nazi Era Red Flag

The Zinckgraf name appears 55 times in the Linz (Hitler) collection database, usually with little or no information about the former  owner,  This portrait of a man ((Linz no 0408) by Moritz vonSchwind, was delivered to the notorious Maria Almas-Dietrich.

Friedrich Heinrich Zinckgraf ( 1878-1954), played an important role in the Aryanization of the Jewish-owned Galerie Heinemann and the transfer of Jewish art collections to Nazi officials and other collectors