2 1 / 2 Heller Kaiseryacht, variety "unperforated" with hand-stamped overprint "Worthless", from the right margin of the sheet, mint never hinged, flawless condition, unsigned, photo certificate Ronald F. Steuer BPP "perfectly flawless and extremely rare specimen.", Michel 2,000.- - edition of only 100 pieces (one sheet), which was publicly auctioned in 1997, a stamp missing from many collections!