We believe the restoration work was done by Art Restoration Corp in Miami. Click here for the Sunbiz document showing a Mr. Koch as part owner. 

Compare the colors used in the van Gogh painting below to the curtains in the Maria Sethe painting below by Theo van Rysselberghe. Van Gogh could have borrowed paint from Theo. They were traveling together during this time period. While traveling with Theo van Rysselberghe, van Gogh would most likely have been able to paint this Sultan.

The following article shows Frederick R. Koch owned van Gogh's.

 "After 1980 buyers, led by Wendell Cherry, Fred Koch and the Getty Museum, elevated French Impressionism, Van Gogh, Picasso and early 20th Century Europeans to the summit and ensured that on the auction houses' current list of the Top 100 Pictures Ever Sold, no fewer than 92 are works since 1870. “ 

Alexander Calder | Camille Bombois |  Éduardo Manet | Jane Peterson | Jim Cassel | Kees van Dongen |  Pablo Picasso | Vincent van Gogh

Stolen Charles Darwin Notebooks

Photographed and then stolen by one of the Koch brothers.

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