There is no key, but the back comes off very easily. The plastic has an imperfection as pictured. There is a flying duck on the top on these machines and it is missing from this one. The machine measures about 18" Z 24" X 10. The item "Vintage Silver King Duck Hunter Gum Ball Machine from 40's for Restoration" is in sale since Wednesday, November 30, 2016.This item is in the category "Collectibles\Banks, Registers & Vending\Vending Machines\Gumball". The seller is "lonelake" and is located in Oak Harbor, Washington. This item can be shipped to United States.