Hradčany Castle, 4 koruna, inverted overprint 'POŠTA ČESKOSLOVENSKÁ 1919'

Czechoslovakia · 1919 · 4 K

This definitive stamp features a view of Hradčany, the Prague Castle complex, a prominent symbol of Czech statehood. It is part of the first series of stamps issued by the newly formed Czechoslovakia. This particular example is a rare error variety where the 'POŠTA ČESKOSLOVENSKÁ 1919' overprint was applied upside down.

Issued shortly after Czechoslovakia's independence in 1918, this stamp represents the nation's new identity. The inverted overprint error is one of the most famous and sought-after rarities in all of European philately.