Untested selling as is for parts or repair Vintage R.C. Allen mechanical adding machine features a classic black metal housing with a distinctive green textured faceplate. This manual calculator includes a full numeric keypad with high-contrast black and white keys, side-mounted hand crank, and integrated paper roll holder. Manufactured by Allen Calculators, Inc. in New York, it displays the iconic R.C. Allen branding on both the front and rear. A significant piece of office history, this heavy-duty machine showcases mid-century industrial design and mechanical complexity.