Used Stamp Collection from Austria and Poland

This is a small collection of six philatelic specimens housed in a vertical strip stockbook page. The collection includes four Austrian (Republik Österreich) stamps and two Polish (Poczta Polska) stamps. The top left stamp is an Austrian issue celebrating the Academy of Music, featuring a theatrical mask and cello in a pale violet/grey hue. Adjacent is a stamp commemorating the Vienna Philharmonic, showing musical instruments. Below these is a horizontal commemorative stamp depicting a grand organ from the Musikverein, marked with a gold border and '100 Jahre.' To its right is a smaller blue stamp featuring a female figure. The bottom row consists of two Polish stamps: one commemorating Chopin with a piano keyboard motif in deep purple, and a brown 'Doplata' postage due stamp featuring a post horn. The stamps show various states of postal use; several exhibit partial black circular date stamps (postmarks). The perforations appear largely intact, though the paper shows slight yellowing consistent with age, likely mid-20th century (circa 1950s-1970s). The stamps are secured behind clear plastic or glassine strips, and the stock page itself shows minor foxing and toning. The craftsmanship reflects standard steel-engraved or lithographic printing processes common for European state-issued postage of that era.