2 Pesa imperial yacht, o. watermark, horizontal pair, imperforated proof print from proof sheet, Friedemann number P18, still in the light shade mid-brown, unused with hinge remnants at the lower margin, on all sides wide margins with left side margin, expertized Koehler, photo expertize Dr. Karl Pauligk BPP (2001) "excellent condition. multiples this proof are very rare", Michel 6.000.-