This is a vintage illustration of a prosthetic arm and its supporting harness. The prosthetic is a full arm, extending from what would be the shoulder down to a hand with articulated fingers. It's a light-colored, streamlined design, with the name 'A.A.MARKS.M.' printed along its length. The harness is a complex system of leather straps and supports. A broad shoulder strap connects to a leather casing that encases the upper arm portion of the prosthetic. Below this is a more fitted leather section that likely secures around the upper arm. The entire system appears designed to distribute the weight and provide stability. Below the image, the number 'No. 950.' is printed in a simple font.