Made by Imfield or Emfield in the late '80's - years before AM made their GG-1s. Limited production cottage industry type of thing.
The (San Francisco Bay Area) Golden Gate American Flyer club members bought a bunch of them. We ordered them and then waited two years to get them. Most of the other guys units conked out, but mine kept going.
Where did you find yours? What part of the country is it from?