Early 1900's Brass Doorknob & Backplates

We believe this Brass Doorknob and matching Backplates were made by the Sargent Company in the early 1900's? We have collected enough of this lovely Victorian pattern to do all the doors in our almost 100 year old home in Kentucky. Looking for a couple Door Push Plates in this pattern and our hardware will be complete. Plate measures 7 inches L X 2 1/4 inches W :)