Poland 1960 – 100 Years of Polish Stamp – Block of 4 × 2.50zł – Used

Block of 4 used stamps from Poland 1960 commemorative issue marking the centenary of the first Polish postage stamp. Each stamp has a 2.50 złoty denomination with gold and olive background featuring a stamp-within-stamp motif showing a woman writing a letter. Circular cancellation on each stamp. Sheet margin inscription “100 LAT POLSKIEGO ZNACZKA POCZTOWEGO” visible at the top. Perforations intact on all sides. Clean used block in protective sleeve.