Cast Iron Mechanical Banks - Stevens

I need some opinions on these pieces. I recently purchased them from a guy who had no more interest in keeping them.
Please excuse the first name but that's what's on the back of the bank itself. The names are listed below from left to right.

"Jolly Ni**er Bank"
"Dinah"
"Worlds Nation Bank - Book of Knowledge"
"Two Frog Bank"?

All I really know about them is that they are cast iron and the Worlds Nation Bank is a possible 1920's or 1930's reproduction. I'd like to know the value of each piece if anyone knows it. I've seen these pieces go from anywhere between $80 - $1,000,000. I seriously doubt I have a huge score here but I'd like to know what the value would be for them!