Found this glass lid at a yard sale for 50 cents, It looks a lot like wagner lids I've seen. Did Wagner Ware make unmarked lids? It says C-8 Made In USA and fits many of my #8s.
http://www.flickr.com/photos/bday06041975/10232790986
http://www.flickr.com/photos/bday06041975/10232790526/in/photostream/
http://www.flickr.com/photos/bday06041975/10232790986
http://www.flickr.com/photos/bday06041975/10232790526/in/photostream/