I have a Tappan electric stove. I can't find a model number, checked doors, sides, ovens, the pull-out drawer. It's a double-decker: oven and 4 burners on the bottom level; smaller oven on top. All the controls are on a glass panel to the right of the top oven. I'm guessing about 15 years old. There is no latch to lock the bottom oven. When I turn the dial to "clean," "lock" lights up, but the door opens. Any clues to finding the model number or locking the oven door? (There’s no lever.) Thanks!