Antique mercerized cotton wrapped piping welt cord trim presented on its original cardboard bolt. This black sewing trim features a fine, lustrous finish characteristic of high-quality mercerized cotton, ideal for Victorian-era garment restoration, upholstery projects, or period-accurate costume design. The cord is tightly wrapped, providing a structured yet flexible edge for seams and decorative detailing. A rare find for collectors of vintage notions and textile history enthusiasts.