This is a metal offset hinge, marked Arcade 905 and Design Patent 105649 on the rear. Documents relating to Design Patent 105649 seem to indicate the design patent was assigned to Arcade Manufacturing Co. of Freeport, Ill. In 1945 or 46, Arcade was purchased by Rockwell Manufacturing Co. This hinge has cosmetic blemishes but mechanically seems to operate. It may need to be oiled occasionally. The hinge pin and bearing are removable. It weighs about 14 ounces and is about 6 inches by 3.75 inches assembled. The photo is of the actual hinge.
I bought some boxes of ‘stuff’ from a store. According to its employees, they were left in another store when it closed (the boxes, not the employees). This was in one of the boxes.