Thanks Toby for sharing your deep knowledge, much appreciated !
I know
http://www.uniformology.com/INSIGNIA-00.html and used it for example to research the correct backing of helmet plate centers. Very good made and informative site !
Of course i saw the Schoolmasters in K&K and i would expect that their cipher is made from white metal or silvered, silver plated. No traces or residues of silvering or silver plating on my cipher.
I think your conclusion that this cipher was worn by members of other staffs is logical and eloquent, may be garrison staff personal.
I dont think that this bar with the cipher is fake or fantasy, it absolutely gives the impression of a contemporary badge.
So i will keep it in my small collection of corps & departments, but with a questionmark who may have worn this badge .......
May be one day the missing source will show up.
Thanks again and kind regards
Markus