Airmail, 1918, 6¢ orange. O.g., very lightly hinged, centered amid evenly balanced margins, bright color, fresh and Extremely Fine, choice; with 1997 A.P.S. certificate. Scott No. C1  $60. $0 (Image)

Airmail, 1918, 6¢ orange. Two left margin blocks of four (one with arrow and center line), o.g., never hinged, fresh, Fine. Scott No. C1  $1,000. $0 (Image)

Airmail, 1918, 6¢ orange. Top arrow and plate no. block of 6, slogan cancels, diagonal crease at bottom right, otherwise Fine. Scott No. C1  $725 as mint. $0 (Image)