Cast Iron pot with a white lining?

I was browsing in an antique store and saw a few cast iron items. One of the pots had a white lining inside. I think it must be some kind of enamel. The white stuff was cracking off the inside of the pot. It looked unusable. Have any of you seen cast iron like this?
This place also had the corn shaped corn bread pans but they wanted $75 bucks. To much money in my humble opinion.
Doris
This place also had the corn shaped corn bread pans but they wanted $75 bucks. To much money in my humble opinion.
Doris