White opaline lampshade with transparent edge

Beautiful white opaline lampshade with a transparent wavy edge. It probably dates from the 50s, maybe a little earlier. It is in very good general condition, just a micro-scratch on the lower side and small chips in the thickness of the neck which is used to hang it, but not annoying and not visible since they will be hidden by the suspension claw. It measures 25.5 cm in diameter, 5.5 cm in height between the bottom edge and the top of the neck. The outer diameter of the claw holder neck is 5.6 cm.