German WW II Leather Case for "Aiming Circle 31"

Black leather case with white stitching, case is about 7-1/2 inches tall and about 4-1/2 inches wide and 3-3/4 inches deep with two leather belt loops on back. Shows some wear and age but still very nice. Marked inside top of lid with maker code, looks like "jnz" over 41 date with eagle and swastika Waffennamt in blue black ink. See Vol. 3 Uniforms & Traditions of the German Army 1933-1945 by John Angolia & Adolf Schlicht page 224. Overall shows light age and wear. Exc. + $85.00