Topic: Fryderyk Chopin - International piano competition

The following Polish postage issues commemorate international Chopin piano competitions:

Fischer 737-739 (1954: 5th competition)
Fischer 759-760 (1955: 5th competition)
Fischer 1878 (1970: 8th competition)
Fischer 2261 (1975: 9th competition)
Fischer 2566 (1980: 10th competition)
Fischer 3412 (1995: 13th competition)
Fischer 4057 (2005: 15th competition)
Fischer 4643 (2015: 17th competition)