Hello Kevin, in the 1870s the branches of the imperial german navy were completely divided in a nautical and a technical ressort. All personal serving " on deck " like seamen, gunners aso were trained at the so called Matrosendivision, all technicl like stokers, mechanics, craftsmen aso were trained at the Werftdivision. In 1884 uniform regulations were changed and from that time all personal from the Werftdivisions (1st in Kiel, 2nd in Wilhelmshaven) had to wear silver coloured buttons, metall-sleeve-badges and also silver-lettered cap ribbons. This stated until the end of the imperial navy in November 1918. The letters in the ribbons were first woven with genuine silver wire and around 1900 silver was changed for aluminium that does not get dark by oxydation. The personal from the Matrosendivision wore all badges and letters in gold. Later formed formations like Torpedodivision, Luftschiffabteilung, Minenabteilung, Unterseebootsdivision... were splitted also in nautical and technical personal. So a sailor, trained at the Unterseebootsdivision wore golden letters, a stoker silver (aluminium) letters. We have written a nice little book about all this, 440 pages and 1200 pictures about german cap ribbons until 1918... but only available in german. Regards Markus Bodeux