This is a beautiful souvenir stamp sheet, issued by Central Africa in 2012, to help commemorate the 80th anniversary of the Osoaviahim-1, a Soviet hydrogen filled air balloon that allowed observers to take pictures of the Earth's surface from high altitudes. Unfortunately, during the balloon's maiden voyage, the craft collapsed after seven hours, killing its three crew members. The sheet also features photographs from Sergy Tkachenko. The sheet is Post Office fresh, mint never hinged, and F/VF. Click here to visit my eBay Store for other auctions and Direct Sale items:
