This is a Russell & Erwin ‘Brunswick’ door hardware set, designed ca. 1897. The set consists of 2 steel doorknobs (H-46400) 2 bronze-plated steel backplates, a functional mortise lock, a skeleton key, and a strike plate. The original bronze plating is mostly worn off on the hardware. Mounting screws can be provided- send me a message if you’ll need them included. I am happy to answer any questions or provide additional photographs. Dimensions can be seen in the photos or below Backplates: 2-5/16” x 7-1/2” Mortise Lock: 3-3/16” x 3-11/16” Art Deco Art Nouveau Eastlake Victorian Architectural Salvage
eBay