Door Knobs buy with unusual Mortise Vintage

We have Door Knobs with unusual Mortise Vintage set. I believe the knobs are ?brass not positive but they do not stick to a magnet. The mortise is included, the plunger is connected. The center mortise is round with the plunger attached with a screw to adjust it. From one side to the other the knob measures about 5 3/4" with the knob being about 2 1/8" across the faces. The mortise alone measures about 1 1/4" across x 1 1/4" in d. The knobs show some surface wear and age. The mortise does have some surface rust on it. The door plates are matching with paint splatter on both as seen in my photo's. Overall I would say the set is in fair to good condition. buy