I have a group of nine pale blue, vintage, blown glass plates. They date sometime prior to 1950.?

Three (3) are 10 1/2″, six (6) are 7 1/4″. Each has a lovely swirl design. All have pontils, folded over edges, and tiny bubbles in the glass. (There was another plate and a small bowl w/handles, but they were badly damaged.) I was told that they may be BLENKO, but have been unable to verify this by looking on their website, although they have similar dishes in the same color, but without the swirl pattern. Any ideas or suggestions to help identify these dished would be helpful.