Airmail, 1918, 16¢ green, top margin arrow block of 4, o.g., never hinged, choice centering, fresh with deep color, Extremely Fine; with 2012 P.S.A.G. Graded certificate for plate block (90). Scott No. C2  $520. $0 (Image)

Airmail, 1918, 16¢ green, centerline block of 4, o.g., never hinged (small gum tone spot on bottom right stamp), bold color, Very Fine. Scott No. C2  $520 for singles. $0 (Image)

Airmail, 1918, 16¢ green, top margin plate "8900" block of 6 with arrow, o.g., center stamps h.r., others never hinged, beautifully centered, striking deep color, Extremely Fine and choice. Scott No. C2  $900. $0 (Image)