Set of 3 Purple enamelled lampshades and balance system

Beautiful set of three vintage lampshades in purple enamelled sheet metal with their screw fastener, as well as their matching weight/balance and their attachment system in white porcelain and metal (see one of the photos for an idea of the rendering). Very decorative. Diameter of 30.5 cm. Good general condition, some small lack of patina due to age, some spots.