Ephemera › HS 2680 - Invoice from William Potter & Sons, Excelsior Steam Works, Aldersgate Street, London 1892 Image 1 of 1 HS 2680 - Invoice from William Potter & Sons, Excelsior Steam Works, Aldersgate Street, London 1892 £20.00 Out of Stock Window Tickets, Shop and Brass Fittings. Rough right margin Out of Stock Added! Window Tickets, Shop and Brass Fittings. Rough right margin