German telephone earphone with its case. Kopffernhörer alter Art, circa 1905-1910 manufacturer Siemens & Halske with its cable and plug. In its beautiful brown leather case, manufacturer Cobau in Berlin, dated 1915, closing strap in good condition, internal housing for the whistle, loop and suspension thimble. Good condition. German Telephone Earpiece with Its CaseEarly type Kopffernhörer dating from circa 1905-1910, made by Siemens & Halske, with its cable and plug. Contained in a fine brown leather case by Cobau, Berlin, dated 1915, with closure strap in good condition, internal compartment for whistle, and suspension fittings. Good condition.