Thanks Jon,
I just found this one on Ebay. The one I posted is apparently missing the outer portion as compared to the one here:
http://cgi.ebay.com/1928-Fro-Joy-Bab...item23034d8dd4
The seller's description states his example contains a "depressed center area......" approx 6 x 8 3/4. Total approx 8 5/8 x 12.