Vintage Pipe Ad (1919): WDC Bakelite stems

Bakelite was one of the first plastics made of synthetic components, developed around 1909. It didn't take long for it to be used for pipe stems. The Demuth company were not the only ones to use it for pipe stems. As far as I know, I've never personally owned a pipe with such a stem. Most stems these days are made from vulcanite (hard rubber), acrylic (very hard plastic), or on really cheap pipes, nylon. I hate nylon stems.