Antique/vintage? cast iron Coca Cola wagon/horses age?

I don't know the age or history behind this wagon set. It is cast iron coca cola wagon with horses, driver, crates, & tiny little coca cola bottles. The crates & bottles are plastic, They look alittle melted in spots. T aren't enough bottle for all the crates. Everything else is iron except the inside bed of the wagon is metal. The set is in much need of cleaning. Looks rusted. I don't want to mess it up trying to clean or restore it. So I am leaving it as I got it. The wheels turn freely. They wagon detaches from the horses, and the drives comes out of the seat, (hooks into it). Its very hevy & sturdy. Sold as is. The measurements are aprx. Wagon: 9" long, 3 1/2" wide, & 3 3/4" tall. Horses: 4 3/4" long, 4 1/4" tall to the top of the head. Front wheels are aprx. 2" tall, back wheels 2 1/2" tall.