original and intact late 19th or early 20th century american antique interior residential passage door mortise lock possibly fabricated by the sargent hardware company. the ornamental stamped steel face plate retains the original copper plating darkened over time. the latch and dead bolt are original and fully functional. the baked black enameled cast iron lock box is free from damage. measures approximately 5 1/4 x 1 x 3 1/4 inches.