Jewish heirs challenge Sotheby's auction of Van Gogh claimed as Nazi-looted art

Heirs of a Jewish collector claim Van Gogh's 'Castaños en Flor' was sold under duress during the Nazi era, challenging its auction at Sotheby's New York. The Blaquier Arrieta family asserts ownership for over 50 years, while Sotheby's seeks a resolution. The dispute tests provenance standards and could set precedent for restitution claims.

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