The information I have is that there seem to be lots of Coca-Cola cast-iron items out there. However, this is an area to be aware of reproductions because no original cast iron toys have been made by Coke. These are part of a category called fantasy items, new items made to look old.
That doesn't mean they are worthless. Some people like these. In fact, I have one toy myself and it's neat. However, price will really depend on the demand for such an item. Watch the online auctions for ideas on value.