Thats a corn bread pan. Its worth 25 or thirty dollars. What you ought to do is get some mineral oil and generously apply it the pieces. Take this piece right here, you'd be very surprised how much better it would look, and be, if you doused it with mineral oil. And it helps loosen that rust up too. If you don't have time or don't want to clean them all before you sell them, putting mineral oil on them is the next best thing. How soon do you think you will be selling these items?