Art Deco ceiling light "Amsterdam School", 1930/1940

Very beautiful ceiling light of the Art Deco variant "Amsterdam School". Fine opaline glass with brass and porcelain lamp fitting and holder. Probably manufactured between 1930 and 1940.
Condition: The opaline glass lampshade is undamaged, no chipping or cracks, rim is flawless. Socket and holder with age-related patina, but undamaged. The slightly corroded chain has been treated with wax to stop the corrosion.
Dimensions: Lampshade height 20 cm, diameter 25 cm, chain length 55 cm