The piece is about 4 3/8″ tall, 3 3/8″ wide (at base). The knob turns the piston up & down but there is missing pieces at the piston rod base, linkage that would move the cylinder sleeves and there is light hairline cracks that need to be filled in on the case. Item needs to be restored to work properly. The free listing tool. The item “Vtg 1914-1933 Willys Knight, Cutaway Engine Valve Demonstrator, Salesman Sample” is in sale since Saturday, May 14, 2016. This item is in the category “Collectibles\Advertising\Automobiles\American\Jeep & Willys”. The seller is “pinehorse” and is located in New Athens, Illinois. This item can be shipped worldwide.