This commemorative stamp from Austria (Republik Österreich) was issued in 1985 to celebrate the 25th anniversary of the Operetta Weeks (Operettenwochen) festival in Bad Ischl, a famous spa town with deep connections to Austrian musical culture. The design features the elegant Kurhaus theatre building in Bad Ischl, alongside theatrical masks and musical notation symbolizing the lively tradition of operetta. The stamp was designed by W. Pfeiler, blending architecture and performing arts in a vibrant turquoise and gold palette. It highlights Austria’s rich operetta heritage, associated with composers such as Johann Strauss II and Franz Lehár, who had strong ties to Bad Ischl. This issue is popular among collectors of music, theatre, and Austrian cultural heritage stamps.