This hinge pair has the flashed copper treatment. In the first twenty years of the 20th Century, this treatment was very popular. A copper coating was put over the steel base and then flashed with black lacquer. Some of the flashing has been worn off.
The round base measures 1 1/8 inches round. It is fastened to the cabinet with one screw. The pen of the hinge is 1 3/8 inches long. Screws will be included.