White opaline daylight and transparent wavy edge

Beautiful white opaline lampshade with a transparent wavy perimeter. It probably dates from the 50s maybe a little earlier. It is in good general condition, no crack, but does not hide its age: a small lack in the thickness of the collar that serves to hang it, but not annoying and not visible since it will be hidden by the suspension claw. And a small hole in the glass, perhaps original because in this place the glass is very thin, on the border between the white part and the transparent ripple, very little visible, and even less once the lampshade is suspended. It measures 25.5 cm in diameter, 5 cm in height between the edge and the top of the claw holder. The outer diameter of the claw collar is 5.5 cm. It weighs about 360 g.