This knob manufactured by the Sargent Company in New Haven, Conn. around 1905 is either brass or possibly bronze. The three-fold pattern is on only the top of the knob. Note the beading around the edge of the pattern.
The knob measures 2 1/4 inches across and approximately 1 3/8 inches deep. The neck is 3/4 inch long.
We have only oil rubbed with a cloth this one. We usually do not polish these old knobs. We love the patina.