I think it has generally been the opinion that if the Moonie when backlit gives off that reddish-yellow glow you similarly get from milk glass it is Akro but if there is a blue tinge to it the Moonie is Christensen. For a while there in the 1990s there were a bunch on 'Moonies' floating around which had the reddish-yellow glow but were creased all ta heck all over and it was hard to attribute them to Akro, Akro being so particular about the quality of their marbles, but I think they were dug Akro that just didn't measure up. The Hardys were selling them at what amounted to a discount like they'd have a full jar of them! David