I have collected toys for over 40years and I have never seen this toy either. However, I would suggest that you search through some of the early cast iron toy makers. Makers like Ives, Hubley, Arcade, Dent, Kenton, Shimer, Ideal, Wilkins, etc.. I would especially look at early Kenton and Arcade toys. This toy probable originally had a "Plinky" windup motor on the bottom. Something does strike me as odd. The figures represented on the toy don't strike me as especially old while this type of cast iron base would suggest significant age. Could this be a "put together" toy; a top and bottom that didn't originally come together? This is a real problem with old, original horse drawn cast iron toys.