Jakob Bengel Art Deco Necklace - 1930's

This is actually my very first necklace by Jakob Bengel. I bought it about 2 years ago in a yard sale and never thought of showing it here as it not the most dramatic piece I own. I wasn't sure it was by Bengel so I sent a message with pictures to the Jakob Bengel Museum via Facebook. They confirmed that my necklace was the work of the famous German designer and that was the start of my Bengel collection!
It is made of silver-toned metal and black galalith. The central galalith part measures 4 cm across (approx. 1' 1/2).

By the way, I just created a Facebook page to share my jewelry collection (plastic jewelry mainly, Art Deco, designer's jewelry, antique and contemporary...):
https://www.facebook.com/pages/Plastic-Fanatic/349163695276950?ref=aymt_homepage_panel
Go take a look! ;)