Jakob Bengel Art Deco/Modernist Necklace, orange galalith and chrome, cubist design, rare, 1932.
This pendant with a different Bengel chain appears on page 199 of art Deco Schmuck and page 130 of Bengel Art Deco Schmuck.
The Jakob Bengel factory was abandoned in World War II and rediscovered in 2000. It is now a museum in Idar-Oberstein, Germany and there are two books published on their modernist jewellery. Galalith is the German form of Bakelite.