1932, July 5 -- Mattern and Griffin Round the World Flight. U.S., German and Russian franking appropriately tied on flown cover to New York City signed by Mattern and Griffin, usual light toning bands from envelope adhesiveVERY FINE. AN IMPORTANT TRANS-OCEANIC FLIGHT RARITY FROM THE MATTERN AND GRIFFIN 1932 ROUND-THE-WORLD FLIGHT. ONLY FIVE PIECES ARE REPORTED TO HAVE BEEN SIGNED AND CARRIED. AAMC No. 1167. Estimate  $1,500 - 2,000. $0 (Image)