Somptuous Ulysse Nardin Art Deco 🤩 from 1918, first wristatch produced by U.Nardin with a beautiful dial with radium numbers marked "W.Türler Berne" (Swiss reseller in Berne & Zurich) and art deco hands, running with a mechanical caliber 13´´´ 1144-1146 F (thirteen ligne, ca. 29.3mm) 15 jewels by Fabrique d'Horlogerie de Fontainemelon (FHF), protected with a silver case 0.9 with the bear stamp for "Tausendstel und darüber" with office mark for Bienne controled in Neuchâtel (letter N in the eagle stamp?) it seems... Furthermore, a stamp for export to Germany exists the half moon & crown ("Halbmond und Reichskrone") to indicate a silver purity > 0.8.
Read more about the history of Ulysse Nardin; here.