GUEST: It's made with washers and screws and bolts, and it looks more like an engineering piece than a jewelry piece to me. It was my mother's, and we don't know if she purchased it before she came from Europe in 1940, or if a friend of hers, who traveled extensively, brought it to her.

APPRAISER: This is a piece of German jewelry. We can date it specifically to 1931. It's made by a company called Jakob Bengel. He opened the company in the 1870s. He was a locksmith and started a company to make watch chains. And now they're in the jewelry business. And by the early '20s, they're being influenced by the Bauhaus school. The German Bauhaus is a movement that's combining Arts and Crafts and Art Deco. It's a structural design. This is machine age. The material it's made out of is chrome-plated brass. And it drops two pendants of glass that are to look like lapis lazuli, and it's enameled. It's a pretty elaborate example of a brick link form. This piece, if it were to come to auction, would probably take an estimate of $900 to $1,200.

GUEST: We'll have to learn to appreciate it more. Thank you!