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Just for info, Weitze has two blue Luftschutz armbands. One with woven (like the M version here) "O" for Ordnungs- und Sperrdienst at Euro 75 and another with applied "F" for "Fernsprecher," E 80.
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BTW, in my post above the post-war turmoil I'm refering to is, of course, after WW1.

Here's post from another forum with a rather extensive list of Freikorps units but with English designations....

Here's my NSBO armband (it has the stamp as I recalled it) and a image of the HJ grouping with the Melder armband.

The fact that there are several armbands directly related to each other could...

Googled Luftschutz "M" Armbinde and found this:

Wackerhagen trag die Armbinde des Luftschutzhauswarts; einige von den Hausfeuerwehrleuten waren im Arbeitsanzug angetreten, Ilse
Wackerhagen,...

I was trying to post yesterday but got distracted. Meantime, the "M" armband post came in.

I've seen "M" armbands along the way but never paid much attention to them since its purpose was...