I picked this one up at flea market today. From what I can tell, it's a no name Wagner Ware made before 1960. It's flat, has no cracks or pits, and has just a little surface rust on the back. I'm not sure what it's worth, but I only paid $4.53 including tax, so I don't think I got hurt.
https://www.dropbox.com/s/fj3s3skxew8nmpb/2017-04-26 18.24.55.jpg?dl=0
https://www.dropbox.com/s/msgav3zvkiow6zw/2017-04-26 18.25.07.jpg?dl=0
https://www.dropbox.com/s/4e6ybp0uqijlnkv/2017-04-26 18.25.45.jpg?dl=0
https://www.dropbox.com/s/a25qrft6chi3bu9/2017-04-26 18.25.59.jpg?dl=0
https://www.dropbox.com/s/fj3s3skxew8nmpb/2017-04-26 18.24.55.jpg?dl=0
https://www.dropbox.com/s/msgav3zvkiow6zw/2017-04-26 18.25.07.jpg?dl=0
https://www.dropbox.com/s/4e6ybp0uqijlnkv/2017-04-26 18.25.45.jpg?dl=0
https://www.dropbox.com/s/a25qrft6chi3bu9/2017-04-26 18.25.59.jpg?dl=0