Auction: 12033 - The Collector's Series sale
Lot: 486
1930 (May 19) Registered "Aviation Exhibition" Commemorative Cover from USA to Peking, franked on front with a total of 9 stamps and on reverse affixed with 1929 National Air Races and Aeronautical Exposition Cleveland label, handstamped "Found in Oridinary Mail", delivered to Peking, then forwarded to Portugal and finally returned to the US, interesting cover.
Sold for
HK$4,200