Airmail, 1918, 16¢ green. Top margin plate block of 6 with arrow, o.g., never hinged, beautifully centered amid wide margins, bright and fresh with deep rich color, Extremely Fine, choice so nice. Scott No. C2  $1,500. $0 (Image)

Airmail, 1918, 16¢ green. O.g., never hinged, large margins, rich color, Very Fine. Scott No. C2  $150. $0 (Image)

Airmail, 1918, 16¢ green. Block of 4 with vertical guideline, o.g., never hinged, fresh with rich color, F.-V.F. Scott No. C2  $600. $0 (Image)

Airmail, 1918, 16¢ green. Plate block of 6 with arrow, o.g., never hinged, nicely centered amid wide margins, bold color, Very Fine. Scott No. C2  $1,500. $0 (Image)