As Bonhams prepares to auction costumes and props from “Downton Abbey,” a new generation is embracing items that look historical, even if they’re new.

Fans will be able to buy a dress worn by Maggie Smith, a signed script and other memorabilia from the period drama.

Lady Mary Crawley’s wedding dress and the Granthams’ family car, a 1925 Sunbeam Saloon, are among the lots