Octagonal Fluted Glass Doorknob Set with Spindle

his item is a vintage, early 20th-century (Depression Era/Victorian style) mortise doorknob set featuring two molded glass knobs connected by a threaded iron spindle. The face of the knob features a distinct octagonal geometric profile with an embedded circular, multi-faceted fluted pattern that creates a sunburst appearance in the center. The side view reveals the knobs are mounted on aged brass-plated or iron ferrule collars, showing a natural patina and minor surface tarnish appropriate for their age. The glass remains mostly clear with minor internal bubbling and light surface wear but no major structural cracks.