big old yellow ware pottery mixing bowl 12 inch diameter, 1920s vintage Ransbottom Roseville?

Big heavy old yellow ware pottery mixing bowl, 12" across the rim, 6" tall. This I think might be the largest yellow bowl I've ever found, and it's the nicest, no chips, cracks or any particular wear.

I believe this is probably Robinson Ransbottom (Roseville Ohio), 1920s or early 1930s vintage. There's no marks, or if there's a marking it's too faint to see. The shape seems right, as does the weight. It's a beautiful piece.