Victorian Eastlake Style Cast Bronze Door Backplate

This is a rectangular antique architectural door escutcheon, or backplate, crafted in the Eastlake movement style typical of the late 19th century (circa 1880-1895). The piece is made of heavy cast bronze or brass, featuring a complex geometric design characteristic of the aesthetic movement. The surface is deeply recessed with a repeating pattern of stylized floral rosettes, checkered grids, and triangular cross-hatching. It includes a raised circular doorknob collar with a radial 'sunburst' motif and a classic skeleton keyhole at the bottom. The finish shows a genuine aged patina with dark oxidation in the recessed areas (niels) which highlights the intricate relief work. Most notably, some of the recessed squares appear to contain remnants of white or light grey residue, likely old paint or silvering that has worn away over time. There are four circular mounting holes, one in each corner, for attachment to a wooden door. The condition is consistent with its age, showing minor surface scratches, verdigris spotting on the left edge, and rounded edges from decades of handling, but it lacks structural cracks or warping. The high level of detail suggests it was manufactured by a prominent hardware firm of the era, such as Yale & Towne or Sargent & Co.