2 1 / 2 Heller imperial yacht unperforated with hand stamp overprint \"valueless\", mint never hinged, apart from one horizontal paper slight crease trace in the upper area in good condition, without any signatures, photo expertize Steuer VOeB, Michel 2.000.- - very rare! Issued only 100 pieces (a sheet) the 1997 public war auctioned, in many collections missing