Airmail, 1933, 50¢ "Chicago" Zeppelin. O.g., never hinged, precision centering amid huge beautifully balanced margins, rich color, fresh and pristine, an Extremely Fine jumbo, a remarkable gem. Scott No. C18  $95. $0 (Image)

Airmail, 1933, 50¢ "Chicago" Zeppelin. O.g., never hinged, exceptional centering & margins, fresh, Extremely Fine and choice. Scott No. C18  $95. $0 (Image)

Airmail, 1933, 50¢ "Chicago" Zeppelin. Block of 4, o.g., never hinged, fresh and Very Fine. Scott No. C18  $380. $0 (Image)

Airmail, 1933, 50¢ "Chicago" Zeppelin. Top margin block of 4 with plate number, o.g., never hinged, nicely centered, bright color, fresh and Very Fine. Scott No. C18  $380. $0 (Image)

Airmail, 1933, 50¢ "Chicago" Zeppelin. Right margin block of 4, o.g., never hinged (natural gum wrinkle affecting top left stamp), Very Fine. Scott No. C18  $380. $0 (Image)

Airmail, 1933, 50¢ "Chicago" Zeppelin. Block of 4, o.g., never hinged (light natural gum crease affecting right stamps), well centered, Very Fine and choice. Scott No. C18  $380. $0 (Image)

Airmail, 1933, 50¢ "Chicago" Zeppelin. Block of 4, o.g., never hinged (bottom stamps with gum skips and natural gum creases affecting top left and bottom right stamps), fresh and Very Fine. Scott No. C18  $380. $0 (Image)

Airmail, 1933, 50¢ "Chicago" Zeppelin. Top margin block of 4 with plate number, o.g., never hinged (natural gum creases), strong color, Very Fine. Scott No. C18  $380. $0 (Image)

Airmail, 1933, 50¢ "Chicago" Zeppelin. Top margin plate block of 6, o.g., never hinged, strong color, F.-V.F. Scott No. C18  $700. $0 (Image)