David Nahmad’s lawyers are asking a New York court to revisit its recent decision in the long-running dispute over Amedeo Modigliani’s Seated Man with a Cane (1918), citing what they say is new eyewitness testimony that could reopen the case.

In a motion filed after the court’s April 3 decision, which awarded the painting to the estate of dealer Oscar Stettiner, Nahmad’s legal team argues that the work at the center of the claim may have been misidentified from the start. The suit was brought by Stettiner’s grandson, Philippe Maestracci, who has been trying to recover the painting for more than a decade alongside the restitution firm Mondex. The work, estimated to be worth more than $25 million, was bought at auction by a Nahmad-linked company in 1996 and has been kept in Switzerland since.