Airmail, 1918-23 sets complete. O.g., never hinged, all well centered, large margins and rich bright colors, an Extremely Fine set. Scott No. C1-C6  $720. $0 (Image)

Airmail, 1918-23 sets complete. Full o.g., all well centered, #C3 with jumbo margins, an Extremely Fine set. Scott No. C1-C6  $418. $0 (Image)

Airmail, 1918-23 sets complete. O.g., most lightly hinged, an F.-V.F. set. Scott No. C1-C6  $418. $0 (Image)