This Polish Official Mail (Przesyłka Urzędowa) stamp was issued for government correspondence rather than public postal use. The design prominently features the Polish national eagle, symbolizing state authority and administration during the interwar Republic period. The inscription “Zwykła” indicates standard official dispatch, while the “X” denomination represents an internal accounting value instead of a public postal rate. Printed by the State Security Printing Works (PWPW), it reflects Poland’s structured governmental postal system before World War II. Such official issues are highly collectible due to their restricted usage and historical administrative significance.