Lower Merion police are still searching for .
The plaster bust, made in 1779 in Paris by artist Jean-Antoine Houdon, is one of four in existence, said Lower Merion Police Lt. Frank Higgins. A marble version, valued at $3 million, is in the Philadelphia Museum of Art, and another is in the Metropolitan Museum of Art, Higgins said.
Also stolen during Friday's robbery was another piece of art: a shadowbox containing an autographed picture of famous composer Victor Herbert, a conductor's baton and sheet music, he said.
Police are trying to locate Philadelphia resident Andrea Lawton, 46, in connection with the theft. Police have twice gone to Lawton's residence to serve arrest warrants, but she was not there, Higgins said.
"We continue to follow up other leads we're working on," Higgins said. "Obviously we’re most interested in the return of the bust, but we continue to search for her and hopefully she’ll turn up soon. Unfortunately, not much has changed in the last few days."
Anyone with information can contact the police department at 610-649-1000.