There is no keys to this backside comes off with an unscrewing of a screw. This would need to be adjusted as this is not functioning at this time. See all photos for more details, great display piece. The item "Antique Liberty 5 five cent Slot Machine" is in sale since Sunday, October 18, 2020. This item is in the category "Collectibles\Casino\Slots\Machines\Antique Coin Slot Machines".The seller is "autoventures" and is located in Brownfield, Maine. This item can be shipped to United States.