Airmail, 1918-23 sets complete. Blocks of 4, o.g., three C3's, a C4 and two C6's hinged, others never hinged, C1 corner margin and C6 right margin with plate no., rich colors, usual gum skips on first issues, an F.-V.F. set. Scott No. C1-C6  $2,780 for singles. $0 (Image)