Airmail, 1918, 6¢ orange, o.g., never hinged, choice centering and margins, strong bold color, Extremely Fine to Superb; with 2015 P.S.E. Graded certificate (XF-Sup 95, SMQ $400). Scott No. C1  $120. $0 (Image)

Airmail, 1918, 6¢ orange, block of 4 with horizontal guide line, o.g., never hinged, strong color, fresh and Very Fine. Scott No. C1  $480. $0 (Image)

Airmail, 1918, 6¢ orange, duplex cancel, choice centering amid oversized margins, strong brilliant color, an Extremely Fine to Superb jumbo; with 2015 P.S.E. Graded certificate (XF-Sup 95J, SMQ $295). Scott No. C1  $30. $0 (Image)