Airmail, 1933, 50¢ "Chicago" Zeppelin. 3 covers, Chicago Oct 7 to Sevilla, Spain; Miami Oct 23 to Akron; Akron Oct 28 to Friedrichshafen; all with proper handstamp cachets and backstamps, matching correspondent, Very Fine. Scott No. C18  Estimate $150 - 200. $0 (Image)

Airmail, 1933, 50¢ "Chicago" Zeppelin. Bottom margin block of 4 with plate number, o.g., never hinged, Very Fine. Scott No. C18  $400 as singles. $0 (Image)

Airmail, 1933, 50¢ "Chicago" Zeppelin. Bottom plate block of 6, fresh bright color, few gum bends and skips as usual, o.g., never hinged, Very Fine. Scott No. C18  $750. $0 (Image)