I'm pretty sure Wagner DO's only went up to size 11. I have three or four different sets of them and have never seen or heard tell of a size 12. That particular design, with the circles, was used on skillet covers, Round Roaster DO's, and Oval Roasters for sure. Probably something else but I can't think of it right off the top of my head. :-/
And also, and its not clear to me, maybe somebody else can see what they think about it. But in the Oval Roasters like I am talking about above, what sizes were made? I have a three, five, seven, and nine. Was there a number one made? I don't know, thats why I ask. But if you read the BB, to me, its not too clear. I do know Wagner made sizes, 1,2,3,4,5,6,7,8, and 9 Oval Roasters. BUT, did they make a size number one in that style, with the circles? I don't know. :-/