Portugal 100 Reis Inverted Center, Ceres Issue

Portugal · 1912 · 100 Reis

This definitive stamp is part of the first series issued by the Portuguese Republic, known as the 'Ceres' issue. It features a portrait of Ceres, the Roman goddess of agriculture, symbolizing the nation's agrarian roots. This particular stamp is a famous error variety where the central vignette of Ceres was printed upside down in relation to the surrounding frame.

Issued shortly after the 1910 revolution that established the First Portuguese Republic, the Ceres series replaced stamps bearing the image of the deposed monarchy. This inverted center error is one of the most significant rarities of Portuguese philately.