Speckled opaline lampshade

Charming shade in light blue opaline speckled with white (clichy glass perhaps?). The "cloud" effect of the glass is enhanced by its soft "ring" shape. It is in good condition, no crack, a small sheen on the low edge inside, and a defect probably original: a very fine brown mark (visible in one of the photos). Both are very little visible except to have the "nose on it". It measures 12 cm in height, about 13 cm at the widest. The "high" opening (side used for mounting on an applique or other electrification system) is 3 cm in diameter, the "low" opening (the one that lets light pass through and through which the bulb will be screwed) is 8 cm in diameter. This shade weighs 192g.