This butterfly-style hinge pair is listed as a right-hand door pair. They could, however, be also flipped and used on a left-hand door, but the design would be pointing down instead of up as shown in the photo. This pair was manufactured by the National Mfg. Company of Rockford, Illinois around the 1920s.
This half-mortise hinge has the flat, plain wing that is embedded into the jam (mortised) and the fancy wing is fastened to the front of the door. This allows the hinge spine to protrude out away from the door. The hinge pin is different than most hinges in that it is steeple-style.
The hinges were treated with the flashed copper, which was very popular in the first part of the 20th Century. The steel hinge was coated with copper and then flashed with a black lacquer. This fragile treatment has withstood the years of wear on this pair.
The mortised half of the hinge measures 3 1/2 inches by 1 1/2 inches. The fancy wing measures 3 1/2 inches by 3 inches at the widest point.
We have cleaned and oiled this pair. Screws will be included.