Take a moment and check out our other unique auctions!! Exciting new items every day. Philately - The Quiet Excitement.Your feedback is important to us. The Staff at Henry Gitner Philatelists, Inc. The item "ZEPPELIN POST/ SWISS/ POSTAGE DUE/ GERMANY MIX FRANKING ON BOARD FLIGHT 1929" is in sale since Thursday, May 10, 2018. This item is in the category "Stamps\United States\Covers\Event Covers\First Flight". The seller is "hgitner" and is located in Middletown, New York. This item can be shipped worldwide.