Sotheby's and dealer Mark Weiss head to court in Old Master dispute over Frans Hals portrait

Sotheby’s has begun legal action against dealer Mark Weiss over the sale of a Frans Hals painting that it now believes to be “undoubtedly a forgery”. However Weiss said he will "contest the claim vigorously".

Sotheby’s said it filed its claim in London's High Court against Mark Weiss Limited and business par…

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