Postage Due Stamp, Blue

Slovakia · 1927 · 50h

This is a postage due stamp from the First Czechoslovak Republic, which included modern-day Slovakia. The design is simple and functional, featuring the denomination '50' within a decorative, ornate frame. The color is a distinct blue, and the text 'DOPLATIT' at the top indicates its purpose: to collect insufficient postage from the recipient.

Issued in 1927, this stamp was part of a series used across Czechoslovakia to ensure proper postage was paid. The error version, with an inverted overprint, is one of the great rarities of Czechoslovakian philately.