Airmail, 1923, 16¢ Dark Blue, o.g., never hinged, deep color, centered amid evenly balanced margins, Extremely Fine to Superb; with 2011 P.S.E. Graded certificate (XF-Sup 95, SMQ $450). Scott No. C5  $140. $0 (Image)

Airmail, 1923, 16¢ Dark Blue, block of 4, o.g., never hinged, wide margins, natural paper inclusion in top right stamp, F.-V.F. Scott No. C5  $560. $0 (Image)

Airmail, 1923, 16¢ Dark Blue, top margin plate block of 6, o.g., never hinged, fresh with rich color, F.-V.F.; with 1991 P.F. certificate. Scott No. C5  $2,200. $0 (Image)