This stamp from Austria, also known as Osterreich, is a must-have for any stamp collector interested in the history of aviation. The stamp was issued between 1911 and 1920 and features an overprint indicating its use for airmail. The yellow color and WWI topic make it even more unique. The stamp is used and ungraded, adding to its authenticity. It comes from a country/region of manufacture of Austria and has not been certified. Add this piece of history to your collection today!