After more than a year researching and accumulating a 50 different variety of p.w. Gruens 1900- 1940+ I know a little about the various German and Swiss movement models and cases from American, Swiss and Gruen's own fine gold ones. I am still entirely ignorant about Gruen sources for their tremendous variety of decorative metal dials. Most are cheap plated metal silver and gold with painted numbers. Many are seen on the best German and Swiss made watches that have much handwork and solid gold and silver as on some Gruens.. Perhaps someone European could refer me to references for the likely Swiss dial makers for Gruen and other high grade Swiss and German watch producers of 1900 to 40. The double gold ring dial is gold and silver plate. Others probably solid gold since in solid gold cases.