CHINA 2017-22 Foreign Musicians Schubert， Chopin ，Liszt， Mahler Stamp full sheet 

https://www.delcampe.com/en_US/collectibles/stamps/china-1949-people-s-republic-unused-stamps-6/china-2017-22-foreign-musicians-schubert-chopin-liszt-mahler-stamp-full-sheet-474995136.html