Airmail, 1918, 16¢ green, centerline block of 4, o.g., hinge remnant at top, deep color, Extremely Fine. Scott No. C2  $300. $0 (Image)

Airmail, 1918, 16¢ green, top margin plate block of 6, o.g., never hinged, remarkably large margined and well centered throughout, intensely rich color, immaculate freshness, Extremely Fine and choice, a magnificent gem plate block. Scott No. C2  $1,375. $0 (Image)

Airmail, 1918, 16¢ green, top margin plate block of 6 with plate number and arrow, o.g., never hinged, large margins, rich bold color, Very Fine; with 2008 P.S.E. certificate. Scott No. C2  $1,375. $0 (Image)