Official Seal, 1917, gray black, imperf horizontally. Complete pane of 20, o.g., most n.h. with a few hinge marks, some light gum creases, Fine, the only recorded complete pane. Scott No. OX18b  $250+. $0 (Image)

Official Seal, 1917, gray black, imperf horizontally. Vertical strip of four used to seal flap of 1919 registered cover to Brookline Mass. bearing 6¢, 10¢ and 12¢ Wash.-Frank. tied by "Ashland Mass." framed handstamp, "Ashland Mass. Feb 6 1919" backstamp, strip affected from opening, Very Fine use, the only recorded on-cover use of this variety. Scott No. OX18b  Estimate $200 - 300. $0 (Image)