White opaline hanging lamp rises and drops vintage 1930 57cm

Old hanging lamp rises and falls in opaline glass and chrome metal circa 1930 in good condition. The rise and fall does not work like a trompe l'oeil. Otherwise the photos are eloquent, this suspension art deco era is impeccable both in the glass globe and the support. It works with unsupplied bayonet bulb. Its total height is 57cm, the diameter of the sphere is 17cm and the width of the arch is 26cm.