1936 Portugal Costa Flight Stamp with Inverted Surcharge Error

Portugal · 1936 · 50c

The stamp depicts an airplane in flight over a landscape, with 'REPUBLICA PORTUGUESA' and 'CORREIO' at the top. It features an original denomination of '1$50' and a prominent inverted surcharge of '50c'.

This stamp commemorates a significant Portuguese flight in 1936, likely a pioneering airmail route. The inverted surcharge makes it a highly sought-after philatelic error, adding to its historical and collector value.