Unless an out of court settlement can be reached, the case is scheduled to go to trial before Judge William Pauley in Manhattan on September 19 to determine its rightful owner and to seek damages against New York dealer Larry Gagosian and Picasso's granddaughter Diana Widmaier-Picasso.
The sculpture in question is the 1931 "Bust of a Woman (Marie-Therese)," which was on display at New York's Museum of Modern Art until last month as part of the largest exhibit of sculpture by the Spanish master in 50 years.
Lawyers for London-based agents Pelham Europe are demanding that the US court hand over the sculpture, invalidate a rival claim from Gagosian and billionaire Leon Black, and for Gagosian and Widmaier-Picasso, to pay damages.
They say Picasso's daughter, Maya, whose mother Marie-Therese is depicted in the sculpture, directed its sale to Pelham in November 2014 for USD 47 million so it could go on public display in a Qatar museum.
Also Read
Her son, Olivier, however, was fully involved, they say.
But days before the final payment was due, Maya renounced the agreement and rejected the final payment from Pelham.
Pelham's lawyers say an "enraged" Diana had found out and hatched a plot with her long-time associate Gagosian, by which Maya would sell the sculpture to him in secret so he could sell it on for a much higher price.
Although Pelham went to court in Switzerland and France to claim the sculpture back and stop Maya moving it from Paris, it was sold regardless in May 2015, according to US court papers.
That September, the sculpture went on display in the MoMA exhibition in New York as "courtesy of Gagosian Gallery" -- without Pelham's knowledge.