This armband was mixed in with a lot of American WW2 and German WW2 materials that came straight out of a trunk at an estate sale auction. Every other item was genuine and un'played' with.

This looks German to me both in materials and construction.

What could it be?

Some one must have some idea??

i remember seeing something along those lines in Germany when i was stationed there.it's unissued as there would be a stamp after the Nr. i believe at the time that it was a variation on a theme.the GDR were conducting a nuclear disaster scenario and these(or a version of these..) were on armbands of civilians monitoring traffic flow.

Just bringing this back to the top, any more ideas on this item?

Not certain, but I believe the triangle device indicates the West German Civil Defence. So, possibly an armband for that agency.