Attorney David Boies on Tuesday cross-examined the research team for Spain's Thyssen-Bornemisza museum. He asked why they overlooked signs that indicated the provenance of Camille Pissaro's 1897 painting of a Paris street scene was questionable.
One of the museum's experts, Lynn Nicholas, said she couldn't explain why cardboard covering various labels showing provenance had been attached to the back of the artwork. One of those labels showed it had belonged to a Berlin gallery owned by the family of David Cassirer, who is suing to get it back.
Cassirer's great grandmother surrendered the painting in exchange for safe passage out of Germany.
Seventy-nine years ago a Jewish woman named Lilly Cassirer surrendered her family's priceless Camille Pissarro painting to the Nazis in exchange for safe passage out of Nazi Germany during the Holocaust.
On Tuesday her great-grandson will walk into a U.S. courtroom for the latest round of what has been a nearly 20-year battle to get it back.
Cassirer's family is suing Spain for the painting "Rue Saint-Honoré in the Afternoon, Effect of Rain."
The work, valued at $30 million or more, has been hanging in Spain's Thyssen-Bornemisza museum since 1993.
Cassirer's heirs didn't know where it was until 1999. They have been fighting for its return ever since.
Spain says it acquired the painting in good faith and should be allowed to keep it.