There is an older reference that has a small section on Heer related armbands. None that you haven't seen. There is one picture of Two Generals wearing the mourning armband low down near the cuff.
German Army Uniforms and Insignia 1933-1945
by: Brian L. Davis.

It has been and will remain one of my go to references from the time I first became aware of it due to the (IMO), excellent content.

--dj--Joe


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