An antiques dealer who sold a rare African mask for $4.6 million won a legal battle with the elderly couple who sold it to him for $165 without realizing the treasure’s actual worth.

A French court has rejected an appeal by an elderly couple who were paid €150 ($165) for a rare Gabonese mask that later sold for more than €4 million ($4.4 million) at auction.

On View See Kehinde Wiley’s New Suite of Presidential Portraits That Depict African Heads of State With an Ornate ‘Vocabulary of Power’ The artist’s newest body of work, which he has ...