Slovakia 50h Postage Due Stamp, Inverted Overprint

Slovakia · 1927 · 50h

This is a Czechoslovakian postage due stamp, originally issued in 1919, featuring a stylized linden branch. In 1927, it was overprinted 'Slovensko' for use in Slovakia. This particular example is a famous error where the overprint was applied upside down.

This stamp was part of a series overprinted for use in Slovakia following the Munich Agreement and the subsequent partition of Czechoslovakia in late 1938, though the base stamp itself dates from 1927. The inverted overprint is a significant and highly sought-after error from this transitional period.