Sotheby’s is preparing to auction Van Gogh’s Châtaigniers en fleurs (estimated at $180m) amid a dispute raised by Fischer family heirs who allege the painting may have been sold under Nazi-era duress. Sotheby’s states exhaustive provenance research shows no duress sale to date and pledges to work toward a mutually satisfactory resolution with the heirs. The case highlights ongoing complexities of restitution and provenance in high-profile art auctions.