This elegant 50 Heller green stamp, issued by Imperial & Royal Austria (Kaiserlich-Königliche Österreichische Post) in 1908, features the ornate double-headed imperial eagle holding the crowned Austrian shield. Part of the landmark Franz Joseph Jubilee issue, it commemorates the 60th anniversary of Emperor Franz Joseph I’s reign. The design showcases rich Art Nouveau framing typical of early 20th-century Austrian definitives. This value was commonly used for heavier domestic letters and international mail, making postally used examples such as yours desirable among collectors of the Austro-Hungarian monarchy period.