This is a rare shade, made in Germany during the 1930-1935 interval. I have never been able to find one in good enough condition to become part of the collection. If you want to see one in perfect condition with robust colors, turn to page 48 to feast your eyes on photos showing both sides from Jason Walcott's collection. Jason, do you want to sell yours? :)
06/25 Update: This shade brought $255, quite a strong result given the fading.