The seller responded that this was made by Ford for the Model T in 1920. How in the world did we not know this? All of the research that has been done, and we missed this one. HAHA.
Looks like a buzz coil for a electrified fence set-up. Probably never in a car.
They were and are very popular with one cylinder cars and stationary engines. My father runs one in his 1902 Curved Dash Olds. Works very well.