Issued in 1921, this classic Polish definitive stamp depicts a farmer sowing seeds beneath a radiant rainbow — a powerful symbol of hope and renewal for Poland’s newly re-established independence after World War I. The design, printed in deep green, carries the denomination “10 Mk” (Marks) and the inscription “POCZTA POLSKA.” The lower right corner features Poland’s national emblem, the crowned white eagle. This “Sower” series is among the earliest modern issues of the Second Polish Republic and a favorite among collectors for its symbolic artistry and historic importance.