Official Seal, 1888, chocolate brown, double impression. First printing on medium paper, position 29, faint fragment of cancel, vertical fold, Fine, this being one of two known true double impressions of the 1888 Post Office Seal issue, the other residing the Luff Collection at the Philatelic Foundation. Scott No. OX5 var.  Estimate $300 - 400. Examples of double impressions where the images are widely spaced or skewed are known as printers waste. This used example, with closely aligned impressions, certainly escaped the eyes of the inspectors. $0 (Image)