Airmail, 1923, 16¢ dark blue. O.g., never hinged, perfectly centered amid large margins, deep bold color, very fresh, Superb, a pristine gem. Scott No. C5  $150. $0 (Image)

Airmail, 1923, 16¢ dark blue. O.g., never hinged, precision centering amid evenly balanced margins, rich vibrant color, fresh and immaculate, Superb, an outstanding gem. Scott No. C5  $150. $0 (Image)

Airmail, 1923, 16¢ dark blue. O.g., never hinged, P.O. fresh, Very Fine. Scott No. C5  $150. $0 (Image)

Airmail, 1923, 16¢ dark blue. O.g., barest trace of hinge, beautiful centering and large well balanced margins, fresh and very bright, Extremely Fine and choice; with 2005 P.S.E. certificate. Scott No. C5  $75. $0 (Image)

Airmail, 1923, 16¢ dark blue. Block of 4, o.g., top left stamp with barest trace of hinge, others never hinged, fresh and Fine. Scott No. C5  $525. $0 (Image)

Airmail, 1923, 16¢ dark blue. Block of 4, o.g., lightly hinged at bottom, well centered, Very Fine and choice. Scott No. C5  $300. $0 (Image)