This classic colonial issue from Portuguese Guinea (Guiné) belongs to the famous "Ceres" series, first released in 1914. The stamp depicts the Roman goddess Ceres, symbolizing agriculture and fertility, a design created by C. Fernandes and engraved by A. Fragoso. Printed in brown, the 1 centavo denomination was part of the definitive series used across several Portuguese colonies. These stamps are prized for their historical context, as they marked a shift from the monarchy to the Portuguese Republic, with Ceres serving as a unifying allegorical figure. Highly collectible, the Ceres series is considered one of the most iconic in Portuguese philately.