group of three matching uniquely-shaped ornamental cast iron 1870s interior residential passage door backplates

lot of three matching 19th century american victorian era ornamental cast iron doorknob backplates likely fabricated by the sargent hardware co., stamford, ct. the backplates have been refinished and treated with a clear coat lacquer to prevent rust accumulation. the fluted collars or thimbles are free from damage. each plate contains a single skeleton keyhole and two holes for mounting purposes. unique profile. priced for the lot of three. measures approximately 5 x 1 1/2 inches.