Mechanical banks in good quality exploded in price during the 90's. D. Lawless had a good run selling high quality reproductions during that time and still sells them at their storefront in Olney, IL. Prices have come down a bit lately, but if you have an antique mechanical bank in decent condition sitting around the garage somewhere, it could easily be worth $500.
Mechanical cast iron bank. The coin is placed on a plate held by the girl and when the lever is pushed she drops the coin into a trap door (which has its top missing) and the dogs mouth opens and her hand moves along with the dogs tail.