IMHO these old Anschutz sights are masterpieces of simple and efficient design. The long flexible mounting rails have tremendous gripping power, allow a great range of positioning, and will fit any flat rail or arched receiver with grooves close to 11mm, including Anschutz, Diana, or later Weihrauchs (they do NOT fit the slightly wider Walther or FWB grooves, though).
All German sights use the same 9.5 x 1.0 mm eyepiece thread - those fitted in the photo above are from Gehmann, Diana, FWB, and HW! The eyeshade on the right is not a factory part either, but a rather nice home-made one I picked up online. (On the steel sights, the eyepiece thread passes straight through the mounting block to allow such accessories; not so for the 6705/6.)
Just for laughs, here's the 6706 on the Mk 3 Supertarget. The hole in the diopter mounting rail aligns with the sight, to access the trigger adjuster. The red circle approximates where the thumbwheel would have gone.