Hi guys! I need some help to ID this shoulder strap. The cypher looks identical to Kaiser Alexander garde grenadier regiment 1, although color is different (silver) and all I saw on internet is always in gold. Is it important detail or it really doesn't matter in German army ( silver or gold ) for the same regiment?
Also what rank it is?
Thank you all in advance!

a1.jpg (66.36 KB, 32 downloads)
a2.jpg (76.76 KB, 32 downloads)