2 1 / 2 Heller imperial yacht, variety "imperforated" with hand stamp overprint "valueless", from right margin of sheet, mint never hinged, very fine, unsigned, photo expertize Ronald F. Steuer BPP "perfect perfectly and extremely scarce submission. ", Michel 2.000.- - issued only 100 pieces (a sheet), the 1997 public was auctioned, in many collections missing stamp!